Chapter 2 — Food and Health

Food is the material we eat and drink to meet the needs of our body. It provides energy for movement and thinking, raw materials for building and repairing tissues, and substances that regulate body functions. Health is the state of physical, mental and social well-being. The connection between food and health is direct: what we eat affects how we grow, how we resist infection, how active we are and even how we learn at school. This topic introduces the basic idea that food choices and eating habits shape lifelong health outcomes.

To begin, learn that food has many roles. It fuels daily activities, supplies protein for muscles and enzymes, provides fats for stored energy and cell membranes, and offers vitamins and minerals that regulate processes such as blood formation and immune responses. Food also influences mood and concentration. For example, skipping meals may cause tiredness and difficulty concentrating in class, while regular healthy meals support steady energy.

Students should recognise that food choices are influenced by culture, family traditions, availability and cost. These influences are neither good nor bad by themselves; they simply shape habitual patterns that may be healthy or unhealthy. A practical aim is to keep the strengths of cultural diets — such as use of seasonal vegetables and legumes — while reducing harmful elements like excessive oil or sugar.

Three simple principles guide healthy eating: variety, balance and moderation. Variety ensures that different nutrients are supplied; balance keeps the proportions of food groups appropriate; and moderation prevents excessive intake of energy-dense foods like fried snacks and sweets. Practical examples: combining cereals with pulses gives complementary proteins; adding fruits and vegetables increases vitamins; choosing water over sugary drinks reduces empty calories.

Finally, this introductory topic emphasises that knowledge leads to better choices: learning about nutrients, digestion and hygiene helps students evaluate meals, contribute to family food planning and adopt safer practices when buying or preparing food. The rest of the unit will build on this foundation to explain nutrients, digestion, disease prevention and practical household skills that support health for the individual and the community.

Nutrients are the chemical components of food that the body uses for energy, growth, repair and regulation. They fall into broad groups: macronutrients (carbohydrates, proteins, fats), micronutrients (vitamins and minerals), water and dietary fibre. Each group has specific functions and sources. Understanding nutrients helps students plan meals so that the body receives what it needs at each stage of life.

Carbohydrates are the principal source of quick energy. They are found in staples such as rice, wheat, maize, potatoes and fruits. Simple carbohydrates like sugar give fast energy but little else; complex carbohydrates from whole grains and vegetables provide sustained energy and fibre. Fibre, a non-digestible form of carbohydrate, helps maintain bowel health and prevents constipation.

Proteins supply amino acids used to build muscles, organs, enzymes and hormones. Growing children and adolescents need extra protein for tissue formation. Good protein sources include pulses, legumes, dairy, eggs, fish and lean meats. Vegetarians can combine cereals and pulses to achieve a complete set of essential amino acids.

Fats are concentrated energy sources and are required for absorption of fat-soluble vitamins A, D, E and K. Fats also cushion organs and provide insulation. Healthy fats include vegetable oils, nuts and seeds, while excessive saturated and trans fats—found in deep-fried and processed foods—raise the risk of heart disease. Moderation is key.

Vitamins are organic micronutrients that control body functions. For example, B vitamins help release energy from food; vitamin C supports immunity and iron absorption; vitamin A is essential for vision and skin; vitamin D regulates calcium for bones. Minerals like calcium, phosphorus and magnesium are vital for bones; iron is required for haemoglobin in blood; iodine supports thyroid function; zinc aids wound healing and immunity.

Water constitutes a major part of the body and is necessary for circulation, digestion and temperature control. Dehydration impairs physical and mental performance. Altogether, a varied diet containing cereals, pulses, vegetables, fruits, milk and small amounts of fats and sugars usually supplies these nutrients. Learning the roles and best sources of each nutrient helps students evaluate meals and correct deficits before they affect health.

Daily nutritional requirements are the amounts of energy and nutrients a person needs to maintain health, grow and perform daily tasks. These requirements vary by age, sex, body size, activity level and special conditions such as pregnancy. Governments and health organisations provide Recommended Dietary Allowances (RDA) as practical guidelines to indicate average daily intakes that will meet the needs of most healthy people in a group.

Energy needs are measured in kilocalories (kcal) and depend on basal metabolic rate (energy used at rest), physical activity and growth. Adolescents, who are growing rapidly, require more energy than younger children. For example, active teenagers need extra calories to support sports and study. Protein requirements also increase during growth; adolescents need higher protein intake per kilogram of body weight than adults to support tissue formation.

Micronutrient RDAs are set to prevent deficiency diseases. For teenagers, iron is a key nutrient—girls need more iron after menstruation begins. Calcium and vitamin D needs rise in adolescence to build peak bone mass. Other vitamins and minerals, including B-complex vitamins, vitamin A, zinc and iodine, have RDAs adjusted for age and sex. Water needs change with climate and activity; hot weather and exercise increase fluid loss through sweat and thus raise water requirements.

RDAs are tools for planning meals: they help diet planners ensure adequate intakes across the day. For example, a balanced lunch and additional snacks can be arranged to meet a teenager’s energy and micronutrient needs. Vegetarian diets can meet RDAs if they include diverse plant proteins, green leafy vegetables, dairy or fortified foods, and attention to iron and vitamin B12 sources where needed. In areas with high risk of deficiency, public health measures such as food fortification (iodised salt, fortified flour), school supplementation programmes (iron-folic acid tablets) and nutrition education are used to ensure RDAs are achieved.

Students should learn to use RDA tables as guides rather than exact prescriptions. Individual needs differ, and habits like frequent snacking on low-nutrient foods can cause calorie sufficiency but nutrient insufficiency. The energy balance principle is important: to maintain weight, energy intake should match energy expenditure. During growth or physical training, intake must increase appropriately. Understanding RDAs helps students assess their diets, plan balanced meals and recognise when supplements or fortified foods may be needed for health.

Digestion is the series of mechanical and chemical steps that convert the food we eat into small absorbable components the body can use. It begins in the mouth where teeth break down food into smaller pieces and saliva contains the enzyme amylase that starts starch digestion. Chewing mixes food with saliva, forming a bolus that is swallowed and passed down the oesophagus to the stomach.

In the stomach, muscular contractions churn food while gastric juices containing hydrochloric acid and enzymes (like pepsin) begin protein digestion and kill many microbes. The partially digested food, now called chyme, moves into the small intestine where the major phase of digestion and absorption occurs. The pancreas secretes enzymes—amylase for carbohydrates, proteases for proteins and lipase for fats—into the small intestine. The liver produces bile stored in the gall bladder and released into the small intestine to emulsify fats, breaking large fat droplets into smaller ones so pancreatic lipase can act more effectively.

The inner surface of the small intestine has circular folds covered with villi and microvilli. These structures increase surface area enormously to allow efficient absorption. Carbohydrates are broken down to simple sugars (mainly glucose) and absorbed into the blood capillaries of the villi; amino acids from proteins are similarly absorbed into the blood. Fats are broken into fatty acids and monoglycerides, reassembled into triglycerides in intestinal cells and then transported via the lymphatic system as chylomicrons before entering the bloodstream. Water, electrolytes and some vitamins are also absorbed in the small intestine.

The large intestine absorbs remaining water and some minerals, forming faeces from indigestible matter. Beneficial bacteria in the colon help ferment some fibres producing short-chain fatty acids useful for colon health. Healthy digestion depends on adequate chewing, a balanced diet with enough fibre and fluids, regular meal patterns and avoidance of swallowing contaminants. Disorders such as diarrhoea reduce absorption and cause nutrient losses, while conditions like malabsorption syndromes impair uptake of specific nutrients.

Understanding digestion explains why food is cooked to make nutrients available, why certain combinations (like vitamin C with plant iron) improve absorption, and why hygiene is crucial to prevent infections of the digestive tract. It also shows why different nutrients follow different absorption paths—blood for sugars and amino acids, lymph for most fats—and how the body distributes these nutrients to support growth and activity.

A balanced diet supplies the body with all essential nutrients—carbohydrates, proteins, fats, vitamins, minerals, fibre and water—in the right proportions. Meal planning is the practical skill of arranging daily or weekly menus so those nutrients are delivered in appropriate amounts, considering age, activity, cultural preferences and budget. This topic explains how to plan meals that are nutritious, acceptable and sustainable within family traditions.

Meal planning begins with assessing needs: how many calories and which nutrients are required by the individual. For children and adolescents, planning emphasises adequate energy and protein for growth, and enough calcium and iron. For active persons, calorie needs are higher. Practical planning uses food groups: cereals and grains for energy, pulses and animal products for protein, vegetables and fruits for vitamins and minerals, milk for calcium and healthy fats in moderation. Snacks are opportunities to include fruits, nuts or yoghurt rather than sugar-rich processed items.

Cultural practices influence meal patterns and choices. Festivals often feature special dishes high in sugar or fat. Rather than rejecting tradition, adapt recipes to preserve flavour while improving nutrition—use less sugar in sweets, swap deep-frying for baking, add nuts and fruit to traditional preparations. Seasonal and local produce should be preferred because it is often fresher, cheaper and culturally familiar. Respecting cultural tastes increases acceptance of healthier menus.

Practical steps for planning: (1) Ensure variety across the week so the same nutrient is not always missing; (2) Combine complementary proteins (e.g., rice and dal); (3) Include at least one fruit and one vegetable daily; (4) Plan portion sizes to avoid excess calorie intake; (5) Prepare snacks that add nutrition; (6) Use leftovers sensibly with safe storage and reheating. Budget-friendly planning includes buying seasonal vegetables, using pulses and eggs as economical protein sources, and preparing meals at home to control fats and salt.

Students learn to create simple, balanced menus for breakfast, lunch, snacks and dinner. For example, a balanced school lunch could include chapati/rice, a pulse dish, a cooked vegetable, a piece of fruit and milk. Planning must also consider food safety: hygiene during preparation, correct cooling and storage, and attention to expiry dates. Combining nutrition knowledge with cultural sensitivity and practical skills ensures meals that promote health while fitting family life and traditions.

Malnutrition includes both under-nutrition (insufficient energy or nutrients) and over-nutrition (excessive energy intake leading to overweight and obesity). Under-nutrition can present as wasting (low weight-for-height), stunting (low height-for-age) or underweight (low weight-for-age). It weakens immunity, slows cognitive development and increases vulnerability to infections, particularly in children and adolescents who are in critical growth phases.

Causes of under-nutrition include food insecurity—insufficient quantity or poor quality of food—repeated infections, poor infant feeding practices, and social factors such as poverty and lack of knowledge. Consequences are reduced school performance, delayed puberty, and increased risk of complications from common illnesses. Community-level interventions include improving household food access, education on complementary feeding for young children, deworming programmes and micronutrient supplementation.

Over-nutrition arises when calorie intake exceeds energy expenditure over time, often due to frequent consumption of fast foods, sugary drinks and energy-dense snacks combined with sedentary lifestyles. Overweight and obesity are risk factors for non-communicable diseases such as type 2 diabetes, hypertension and cardiovascular disease. In adolescents, concern about body image can lead to extreme dieting or disordered eating, which may cause nutrient deficiencies despite weight changes.

The ‘double burden’ of malnutrition describes communities where under-nutrition and obesity coexist, sometimes within the same household, because of cheap high-calorie low-nutrient foods and unequal access to healthy options. Addressing malnutrition requires both public health and individual actions: ensure food security and access to diverse diets, promote physical activity, teach portion control and encourage consumption of whole foods. Screening tools like Body Mass Index (BMI) help identify at-risk individuals for further assessment. Nutrition education in schools, community gardens and healthy school lunches are practical measures.

At the household level, preventing under-nutrition includes breastfeeding infants exclusively for six months, timely complementary feeding with nutrient-dense foods, and treating infections promptly. Preventing over-nutrition includes limiting sugary snacks and drinks, promoting active play and sports, and teaching balanced meal planning. Recognising early signs—poor weight gain, frequent illness, rapid weight gain or loss—allows timely referral to health services and nutrition support.

Deficiency diseases occur when specific nutrients are lacking for some time. Each nutrient deficiency produces characteristic signs and health problems. Common deficiencies in many communities include iron, vitamin A, iodine and vitamin D. Understanding signs, food sources and prevention strategies empowers families and schools to take simple, effective actions.

Iron-deficiency anaemia is common among adolescent girls due to menstrual blood losses and inadequate dietary iron. Symptoms include fatigue, pallor and breathlessness on exertion. Preventive actions include eating iron-rich foods such as green leafy vegetables, pulses, jaggery and fortified cereals; combining them with vitamin C-rich foods like citrus fruits to enhance absorption; and participating in school-based iron-folic acid supplementation programmes. Deworming helps reduce blood loss from parasites, improving iron status.

Vitamin A deficiency affects vision, especially night vision, and can increase susceptibility to infections. Foods rich in vitamin A or beta-carotene include mangoes, carrots, sweet potatoes and dark green leafy vegetables. Periodic vitamin A supplementation and dietary diversification are standard prevention methods. Iodine deficiency can lead to goitre and impaired mental development; using iodised salt in cooking is a simple, effective public health measure.

Vitamin D deficiency affects bone mineralisation and can cause rickets in children and osteomalacia in adults. Sensible sun exposure, consumption of foods like egg yolk and oily fish where available, and fortified milk can prevent vitamin D deficiency. Other micronutrient shortages, such as folic acid deficiency in early pregnancy, increase the risk of neural tube defects; folic acid supplementation before conception and during early pregnancy is recommended.

Large-scale measures include food fortification (e.g., iodised salt, fortified flour), supplementation programmes targeting high-risk groups, and nutrition education to promote dietary diversity. At the household level, adopting diverse diets, promoting breastfeeding and complementary feeding for infants, ensuring hygiene to reduce infections, and following public health advice on supplements are effective strategies. Schools can support prevention through health check-ups, distributing supplements when recommended, and educating students and families about nutrient-rich foods and cooking practices that preserve nutrient content.

Food safety and hygiene are essential to prevent food-borne diseases caused by bacteria, viruses, parasites and toxins. Contaminated food can cause illness ranging from mild stomach upset to severe dehydration, organ failure or death. Practising safe food handling at home and in public reduces the risk for individuals and the wider community.

Key personal hygiene practices include washing hands with soap and water before preparing food, after using the toilet, and after handling raw foods or garbage. Clean clothing and covered hair reduce contamination. Food handlers must avoid touching food when ill, especially if they have vomiting or diarrhoea. Good nail hygiene and avoiding jewellery while preparing food also help.

Kitchen hygiene prevents cross-contamination. Use separate chopping boards and knives for raw meat and for ready-to-eat foods like vegetables. Clean work surfaces and utensils with hot water and detergent, and sanitise where needed. Store raw foods below cooked foods in the refrigerator to prevent drips and contamination. Follow the rule of cooking foods thoroughly to safe internal temperatures—this kills many pathogens. Reheat leftovers until steaming hot.

Temperature control is important: many microbes grow rapidly between 5°C and 60°C, the ‘danger zone’. Hot foods should be kept above 60°C; cold foods at below 5°C. Do not leave perishable foods at room temperature for more than two hours. When cooling cooked foods, divide into small portions and refrigerate promptly to reduce time in the danger zone. Check expiry and best-before dates on packaged foods; discard if spoiled or past expiry.

Safe water supply and clean utensils are vital. Use safe drinking water for cooking and washing foods. In community settings like schools and canteens, ensure waste is disposed of properly and that areas are free from pests. Food vendors should use clean containers and avoid street dust and flies. Educating families on these practices and demonstrating steps such as correct handwashing and safe storage can prevent many food-borne illnesses and protect the nutrition and learning potential of children.

Food preservation and proper storage keep food safe and extend its usable life by slowing or stopping the processes that cause spoilage. Spoilage occurs due to microbial growth, enzyme activity, moisture, oxygen exposure and insect attack. Understanding different preservation methods helps households reduce waste, save money and maintain nutrient value of seasonal produce.

Traditional methods include drying, salting, sugar preservation (jams, syrup), pickling, and fermentation. Drying removes water that microbes need; it can be done by sun drying or using dehydrators. Salting draws moisture out of foods and creates an environment that inhibits microbial growth; pickling adds acid and salt together to preserve vegetables. Fermentation uses beneficial microbes to produce acids or alcohol that preserve food and add distinct flavours — examples are idli/dosa batter, yoghurt and certain vegetable ferments.

Modern methods include refrigeration, freezing, canning and controlled-atmosphere storage. Refrigeration slows microbial growth and enzymatic changes, extending shelf life of perishables like milk and vegetables for days. Freezing halts microbial growth almost completely, preserving food for months when done correctly. Canning involves heating food in sealed containers to destroy microbes and prevent recontamination. Each method has best practices: blanching vegetables before freezing to retain colour and nutrients; ensuring jars and lids are clean and seals are proper in canning to avoid botulism risk; and cooling cooked food quickly before refrigeration to prevent bacterial growth.

Proper storage within the home includes using airtight, clean containers for grains and pulses to prevent insect infestation and moisture; storing oil away from light and heat to prevent rancidity; rotating stock using the ‘first in, first out’ rule; labelling containers with dates; and keeping the storage area dry and pest-free. For fruits and vegetables, some items like potatoes and onions store better in cool dark places, while others like tomatoes and bananas are best at room temperature until ripe. Dairy and meat products should always be refrigerated or frozen.

Students should learn safe home preservation techniques such as hygienic preparation, correct salt or sugar levels in pickles, and safe canning steps. Small-scale preservation enables families to enjoy seasonal foods year-round and contributes to food security. Emphasis on cleanliness, correct temperatures and proper storage containers reduces spoilage and maintains the nutritional quality of foods.

Food contamination happens when harmful agents—microorganisms, chemicals or physical objects—enter food. When contaminated food is eaten, it can cause food-borne illness. Understanding sources, common causative organisms and prevention enables families and communities to avoid outbreaks and protect vulnerable people, such as young children and the elderly.

Microbial contaminants include bacteria such as Salmonella, Escherichia coli and Staphylococcus aureus; viruses such as norovirus and hepatitis A; parasites; and fungi that may produce toxins. Chemical contamination can arise from pesticides, cleaning agents, heavy metals or toxins in spoiled food. Physical contamination involves foreign objects like hair, glass or stones. Each type presents different risks and requires different preventive measures. Microbial contamination is most common and often related to poor hygiene, inadequate cooking, and improper storage.

Food-borne illness symptoms typically include nausea, vomiting, abdominal cramps, diarrhoea and fever. The severity depends on the organism, the amount eaten and the health of the person. Some toxins cause sudden severe symptoms, while others lead to long-term consequences. Dehydration from diarrhoea is a major danger, particularly for children; prompt fluid replacement is critical. In outbreaks, several people will have similar symptoms after eating the same food, which can point to a common source.

Prevention emphasises the 'Five Keys' approach: choose safe raw materials, keep clean, separate raw and cooked foods to avoid cross-contamination, cook thoroughly, and keep food at safe temperatures. Chemical safety includes proper use of pesticides, correct cleaning agent storage, and avoiding use of non-food-grade containers. Vendors and households should avoid using food past its expiry date and ensure safe water for cooking and cleaning. Reporting suspected outbreaks to health authorities enables investigation and control.

Students should learn to identify likely causes when illness occurs after eating, practice immediate home care like ORS for dehydration, and know when to seek medical help. They should also learn how to safely store leftovers, recognise signs of spoilage, and advise family members about safe practices when preparing or buying food from outside sources. These actions reduce the burden of food-borne illnesses and protect community health.

Personal hygiene and community sanitation are closely linked to nutritional status and overall health. Personal hygiene includes handwashing, bathing, oral care, clean clothing and safe menstrual hygiene. Community sanitation covers safe water supply, sewage and drainage systems, toilet facilities, garbage collection and vector control. Both levels must work together to prevent infections that can cause or worsen malnutrition.

Handwashing with soap at critical times—after using the toilet, before preparing or eating food, after handling animals and after changing nappies—breaks the chain of infection. Proper handwashing technique involves wetting hands, applying soap, scrubbing all surfaces including between fingers and under nails for at least 20 seconds, rinsing and drying. Schools that provide handwashing stations and teach the practice reduce diarrhoeal disease and improve attendance and learning.

Sanitation in the community prevents faecal contamination of water and food. Open defecation allows pathogens to enter water sources and soil, leading to widespread infections. Building and using latrines, ensuring proper sewage systems and covering drains reduce exposure. Safe disposal of household waste, regular cleaning of communal areas, and pest control reduce vectors such as flies and mosquitoes that spread diseases.

Clean water is essential for drinking, cooking and washing. Boiling, filtered or treated water should be used when the safety of water is in doubt. In schools and homes, water storage containers must be covered and cleaned regularly to prevent contamination. Education campaigns that include hygiene promotion and community-led total sanitation help change behaviours and create environments where healthy choices are easier.

Repeated infections due to poor hygiene and sanitation can reduce appetite, increase nutrient losses and impair absorption, causing or worsening malnutrition. Therefore, improving personal hygiene and community sanitation is a cost-effective way to support nutrition. Students can act as agents of change by practicing good hygiene themselves, encouraging family members to do the same, and participating in school projects that promote clean water, latrine use and waste disposal.

Students live in an environment where packaged foods and advertisements are common. Making healthy food choices requires understanding food labels and being critical of advertising. Food labels provide information about ingredients, nutrient content per serving, energy (calories), amounts of protein, fat, carbohydrates, sugar and salt, serving size, manufacturing and expiry dates, storage instructions and any health claims. Learning to read labels helps compare products and choose healthier options.

Key label-reading steps: check the serving size, then examine energy and nutrient amounts per serving; look for total sugars (not only ‘no added sugar’ claims), types of fat (saturated and trans fats are less healthy), and sodium content. Ingredients are listed in order by weight—the first ingredient is present in the largest amount. If sugar, refined flour or unhealthy oils are among the top ingredients, the product is less healthy. Fortified foods list added vitamins and minerals, which can be valuable in populations at risk of deficiency.

Advertising often highlights positive attributes like ‘high in protein’ or ‘made with real fruit’ while minimising negative aspects such as high sugar or saturated fat. Colourful packaging, cartoon characters and celebrity endorsements target children and adolescents. Media literacy helps students ask: what is the overall nutrition profile, what is the serving size, and who benefits from the advertising? Schools can support healthy choices by limiting sale of ultra-processed snacks on campus and teaching students to evaluate ads critically.

Practical advice when shopping: prefer whole, minimally processed foods; choose wholegrain options over refined; select low-fat dairy or portion-controlled amounts; avoid sugary drinks; and prioritise fresh fruits and vegetables. Budget-friendly choices include seasonal produce, pulses and eggs as protein sources, and cooking at home to control ingredients. Understanding labels and claims empowers students to make informed purchases and resist marketing that promotes low-nutrient, high-calorie foods.

Adolescence is a period of rapid physical, cognitive and emotional development. Nutritional needs rise to support growth spurts, increased muscle mass in boys and menstrual needs in girls. Adequate intake of energy, protein, calcium, iron and certain vitamins is critical. Poor nutrition during adolescence can impair growth, delay sexual maturation, reduce school performance and increase vulnerability to infections.

Calcium and vitamin D are essential for building peak bone mass during these years. Dairy products, fortified plant milks, green leafy vegetables and safe sunlight exposure help meet these needs. Iron is vital for oxygen transport; adolescent girls need iron for menstrual losses and to prevent anaemia. Sources include pulses, green leafy vegetables, fortified cereals and animal products where used; combining plant iron sources with vitamin C-rich foods improves absorption.

Energy requirements vary: active adolescents involved in sports may need more calories and carbohydrates, while sedentary youths need less. Protein supports muscle development and repair. Healthy snacking, such as fruits, nuts and yoghurt, provides nutrients between meals and prevents excessive hunger that leads to overeating of unhealthy snacks. Schools can assist by offering nutritious meals and limiting sale of sugary drinks and fried snacks.

Adolescents are also sensitive to body image and peer pressure, which can lead to restrictive dieting or disordered eating. Education should promote a balanced approach: nutrition for growth and strength, not extreme dieting. Regular physical activity supports healthy weight and bone strength. For vegetarians, plan combinations of cereals and pulses to ensure complete protein, and consider fortified foods or supplements for vitamin B12 if needed.

Practical guidance includes taking regular meals, choosing whole grains over refined, including a source of protein at each meal, and ensuring two servings of dairy or calcium-rich foods daily. Adolescents should learn to prepare simple, nutritious snacks and read labels to avoid excessive sugar and salt. Awareness of changing needs, combined with healthy habits, supports optimal growth and lifelong health.

Pregnancy and lactation are life stages with increased nutritional demands to support foetal development and breast milk production. Adequate nutrition during these periods benefits both mother and child, reducing risks such as low birth weight, developmental problems and maternal anaemia. This topic covers key nutrients, meal planning and simple care that support healthy pregnancy and breastfeeding.

Energy needs increase moderately during pregnancy, especially in the second and third trimesters, to support foetal growth. Protein needs rise to build foetal tissues and the mother’s expanded blood volume. Iron requirements increase substantially because of greater blood volume and to support the developing baby; inadequate iron leads to anaemia. Folic acid before conception and during early pregnancy reduces neural tube defects in the foetus. Calcium and vitamin D help build the baby’s skeleton and protect maternal bone stores.

Lactation requires additional calories and fluids to produce nutritionally adequate breast milk. A breastfeeding mother should increase calorie intake by about 300–500 kcal per day (depending on activity) and drink extra fluids. Breast milk composition is resilient but maternal deficiency in some nutrients (e.g., vitamin B12) can affect milk content, so diverse diets and, where recommended, supplementation are important. Exclusive breastfeeding for six months provides ideal nutrition and immune protection to infants; complementary feeding begins thereafter with continued breastfeeding up to two years or beyond.

Practical meal planning includes multiple small meals if appetite is reduced, iron-rich meals combined with vitamin C for better absorption, calcium-rich foods at each day’s meals, and continued use of iodised salt. Pregnant women should avoid alcohol and tobacco and be cautious with medicines and certain foods (e.g., raw or undercooked meat, unpasteurised milk) that increase infection risk. Regular antenatal check-ups enable monitoring of weight gain, blood pressure and haemoglobin; supplements such as iron-folic acid or calcium may be prescribed according to local guidelines.

Support from family and community—help with household chores, ensuring adequate food and rest, and access to healthcare—improves outcomes. Education on breastfeeding techniques and maternal nutrition empowers new mothers to feed their infants well and recover healthfully after delivery. Understanding these needs helps students appreciate the special care required during pregnancy and lactation and encourages supportive behaviours in families and communities.

Special diets are used for medical reasons, cultural or religious beliefs, and personal choices. They must be planned carefully to ensure nutritional adequacy. Examples include therapeutic diets for medical conditions, vegetarian and vegan diets for ethical or cultural reasons, and elimination diets for allergies or intolerances. Food allergies are immune responses to specific foods that can cause reactions ranging from mild rashes to severe anaphylaxis; common allergens include milk, eggs, peanuts, tree nuts, fish and shellfish.

Therapeutic diets are tailored to treat or manage conditions. For diabetes, carbohydrate portions are regulated and emphasis is on complex carbohydrates and fibre with controlled sugar intake. For hypertension, salt intake is reduced. For coeliac disease, gluten-free diets are mandatory and require careful label reading to avoid hidden sources of gluten. In clinical situations, professionals design these diets; at home, understanding the nutrient to be limited and its alternatives is essential.

Vegetarian diets can be healthy at all life stages when planned well. Combining cereals and pulses gives complete proteins; dairy and eggs supply high-quality protein where included. Vegans must be aware of vitamin B12, which is mainly from animal sources; fortified foods or supplements may be necessary. Iron from plant sources is less well absorbed than from animal sources, so combine with vitamin C-rich foods and avoid tea or coffee at meals which reduce absorption.

Food allergy management focuses on strict avoidance of the allergen, reading labels for hidden ingredients, preventing cross-contact during cooking, and having an action plan for accidental exposure. Severe allergic reactions need immediate medical treatment; schools should know which students have allergies and have emergency contact and treatment plans. Educating peers reduces stigma and makes school environments safer.

Students should learn to respect dietary restrictions and make inclusive meal plans. For example, plan school events with options that meet various needs, and practise safe food preparation that avoids cross-contamination. Understanding substitutes—such as using gram flour or mashed vegetables instead of wheat flour for gluten-free cooking, or using fortified plant milk to replace dairy—helps maintain nutrition while honouring dietary choices or medical requirements.