Adolescence: A Stage of Growth and Change · Lesson 4 of 7
Nutrition and Physical Activity for Healthy Growth
“Explain how varied meals and regular movement support the needs of a growing body.”
• Connect adolescent growth with the need for a balanced diet. • Match common nutrients with food sources and functions. • Explain the importance of calcium, iron, and vitamin B12 without treating all foods as equivalent. • Use local food examples to complete a nutrient table. • Describe how physical activity supports fitness, stamina, and mood.
Growing bodies need a range of nutrients
A growing body needs materials to build and maintain its parts, energy for everyday activities, and substances that help its processes work properly. A meal that fills the stomach may still be limited in some nutrients. The question is therefore not simply “Did I eat enough food?” but also “Did I eat a suitable variety?”
A balanced diet provides the different nutrients the body needs in suitable amounts. Carbohydrates, proteins, fats, vitamins, and minerals all have roles. No ordinary food supplies every need by itself. Meals can use familiar, locally available foods; they do not have to depend on expensive products to include variety.
A diet that provides a suitable variety and amount of the nutrients needed for growth, health, and everyday activity.
Connect each nutrient with its job
Carbohydrates are an important energy source for daily movement and activity. Proteins help build and repair body tissues, making them important during growth. Fats also provide energy and support body functions, so a healthy diet does not mean removing every source of fat.
Vitamins and minerals are needed in smaller amounts than the main energy-providing nutrients, but they remain essential. Calcium supports bones and teeth. Iron is important for making the blood’s oxygen-carrying substance. Vitamin B12 supports healthy blood formation and other functions. Their smaller required amounts do not make them optional.
| Nutrient | Examples of food sources | Relevant function |
|---|---|---|
| Carbohydrates | Rice, roti, other grain foods, potatoes | Provide energy for everyday activities. |
| Proteins | Pulses, beans, milk, curd, paneer, eggs | Help build and repair body tissues. |
| Fats | Nuts, seeds, appropriate amounts of cooking oils, dairy foods | Provide energy and support body functions. |
| Calcium | Milk, curd, cheese, and calcium-rich millets such as ragi | Support bone and tooth development. |
| Iron | Kidney beans, spinach, and dried fruits such as raisins or figs | Contribute to healthy blood formation. |
| Vitamin B12 | Milk, eggs, other animal foods, and foods fortified with B12 | Support healthy blood and nerve cells. |
A food may supply more than one nutrient. Milk, for example, provides protein and calcium as well as other nutrients. The amount varies with the food and portion. Similarly, different millets have different compositions; it would be inaccurate to say that every millet supplies the same amount of calcium. A food table helps explain useful contributions, rather than assigning every food to one exclusive box.
Problem
A learner regularly eats only plain rice for lunch. Suggest how locally available foods could make the meal more varied.
- 1.Identify the existing contribution: rice provides carbohydrates and energy.
- 2.Add a complementary food: dal or beans can supply protein and other nutrients.
- 3.Include a vegetable and another suitable food, such as curd, to broaden the range of nutrients.
- 4.Explain the principle: combining different foods improves variety; the lesson is not that rice must be completely avoided.
Build a food–nutrient–function table
The food investigation asks three connected questions: Which food is available? What useful nutrients does it provide? How do those nutrients support growth or health? Keeping the third column prevents the activity from becoming a list of food names to memorise.
Start with the examples in the food table: dairy foods and millets, protein-containing foods, and iron-containing foods. Add locally available examples, checking that each match is accurate. Some cells may contain more than one nutrient or function, because food does not usually have only one nutritional role.
List familiar foods without judging anyone’s lunch. Complete a three-column food–nutrient–function table. For example, ragi can contribute calcium for bones, dal can contribute protein for tissues, and kidney beans can contribute iron as part of a varied diet. Explain each match, and distinguish a food source from the nutrient it supplies.
Problem
One picture shows a group of foods such as burgers, chips, and doughnuts. The other shows a varied meal including grain foods, pulses, and vegetables. Which gives the stronger starting point for everyday nutritional variety?
- 1.Compare the patterns rather than the attractiveness of the pictures: one grouping offers a varied meal with several food groups.
- 2.Connect those groups with functions: grain foods provide energy, pulses contribute protein, and vegetables contribute vitamins and minerals.
- 3.Choose the varied meal as the stronger everyday starting point, while recognising that portions and the overall diet also matter.
- 4.Avoid an absolute claim: one picture does not prove that a single food is always forbidden or that every meal must look identical.
Iron and vitamin B12 deserve careful attention
We can investigate blood-related problems associated with too little iron or vitamin B12. A deficiency means that the body does not have enough of a needed nutrient. Such deficiencies can affect healthy blood formation. Anaemia is one possible consequence and can be associated with tiredness or weakness.
These symptoms alone do not tell us the cause of a person’s problem. A student should not diagnose a deficiency from appearance or decide to take medicines independently. The learning task is to understand the importance of food variety and to find reliable guidance through trusted adults and health services.
A shortage of a nutrient needed for the body to work properly.
Vitamin B12 is not supplied reliably by ordinary plant foods. It occurs naturally in foods such as milk and eggs, and can be added to certain fortified foods. Fortified means that a nutrient has been added during production. If a diet excludes animal foods, an adult or qualified health professional can help check reliable B12 sources. Do not assume that spinach supplies B12 simply because it contributes other useful nutrients.
With a teacher, investigate how local health programmes help adolescents learn about and prevent nutritional deficiencies. Ask a health worker or use an official source to confirm the programme’s actual services. Explain the health need it addresses instead of promising that a particular benefit is available to every student.
Dorothy Hodgkin investigated the structure of vitamin B12 and other important substances. In 1964, she became the third woman awarded the Nobel Prize in Chemistry. Her work shows that understanding a nutrient also involves finding out how its components are arranged; knowing a nutrient’s name is only the beginning of scientific inquiry.
Problem
A student says, “Spinach is useful for blood, so it must supply all the vitamin B12 we need.” Find the error.
- 1.Identify the valid part: spinach can contribute iron and other nutrients.
- 2.Identify the mistaken step: a benefit for blood formation does not mean that every useful food supplies the same nutrient.
- 3.Correct the statement: iron and vitamin B12 are different nutrients with different reliable food sources; a varied diet and accurate information are needed.
Physical activity supports body and mind
Healthy growth involves using the body as well as nourishing it. Games, sport, skipping, and suitable exercises can develop fitness and stamina, the ability to keep doing an activity over time. Movement can also support mood and make shared activities enjoyable.
Physical activity is not limited to winning competitions. Participating in a suitable activity, learning a skill, and enjoying movement are useful goals. Choose activities that fit the learner’s abilities and circumstances, and use teacher guidance for unfamiliar exercises. Comparing body shapes or abilities is not the purpose.
| Physical activity | What participation can support | A thoughtful approach |
|---|---|---|
| Playing a team game | Movement, coordination, and cooperation | Include others and follow agreed rules. |
| Skipping | Practising coordination and stamina | Use a suitable space and progress gradually. |
| Yoga or other guided exercises | Controlled movement and awareness of the body | Learn with guidance and avoid forcing a position. |
The chapter’s yoga project asks a teacher to help organise a small camp. Its focus is learning and participation, rather than copying difficult poses without guidance. International Yoga Day is observed on 21 June, but ordinary physical activity can be part of a routine throughout the year.
Exercise does not remove the need for nutritious food, and a balanced meal does not replace movement, hygiene, or emotional support. These habits work together. No single food, supplement, or activity guarantees complete health.
Problem
A learner joins a game every day but says that nutritional variety is unnecessary because exercise keeps them healthy. Explain what is missing.
- 1.Recognise the positive habit: regular suitable activity can support fitness and stamina.
- 2.Identify the separate need: the growing body still needs energy and materials from a varied diet.
- 3.Connect them: nutrition helps support growth and activity, while movement develops fitness. One does not cancel the need for the other.
Quiz
Why does adolescence make nutritional variety important?
Which match is accurate?
Which conclusion about foods is most accurate?
Which food is a reliable natural example of a vitamin B12 source?
Why is a food–nutrient–function table useful?
Which statement best describes regular suitable physical activity?
Practice Problems
- Explain why eating a large amount of one food is different from eating a balanced diet.
- Complete a food–nutrient–function table with six locally available foods. Show at least one food that contributes more than one nutrient.
- Compare the roles of carbohydrates, proteins, calcium, and iron using familiar examples.
- Explain why a food that supplies iron need not be a reliable source of vitamin B12.
- Suggest a varied lunch using ordinary local foods and explain the contribution of each part.
- Plan a teacher-supported activity session inspired by the yoga project. State how you will include learners with different abilities.
- Prepare questions for a health worker about adolescent nutrition and local deficiency-prevention support. Keep the investigation separate from diagnosing classmates.
Key Takeaways
• A balanced diet supplies a suitable variety of nutrients for growth and daily activity. • Food sources, nutrients, and their functions are connected but are not the same thing. • Calcium, iron, and vitamin B12 have distinct roles and need accurate food-source information. • Suitable regular physical activity supports fitness, stamina, and mood. • Nutrition, movement, hygiene, and support work together.