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Home ScienceClass 11Food, Nutrition, Health and Fitness

Food, Nutrition, Health and Fitness | Class 11 Home Science Notes

By ConceptScroll Team · Published on 17 July 2026 · 3 min read

Food, Nutrition, Health and Fitness – this guide gives you a concise, exam-ready overview of Food, Nutrition, Health and Fitness from Class 11 Home Science, written by ConceptScroll editors and reviewed against the latest NCERT textbook.

3.1 INTRODUCTION

Adolescence is a critical phase marked by rapid physical growth and hormonal changes that affect every organ in the body. This growth spurt significantly increases nutrient needs, which peak during adolescence before stabilizing or decreasing in adulthood. Nutrition, the science of food and nutrients and their effects on health, becomes especially important during this period. Adolescents consume a variety of foods such as dal, chapatti, bread, rice, vegetables, milk, and lassi, which provide essential nutrients necessary to maintain health and activity. Understanding what foods to eat and their nutritional value is crucial for sustaining good health during adolescence. Nutrition is not only about the physiological aspects of food ingestion, digestion, absorption, metabolism, and excretion but also encompasses social, psychological, and economic dimensions. The chapter begins by defining key terms such as food, nutrition, nutrients, health, and fitness, emphasizing the inseparable relationship between nutrition and health. Food is the primary factor influencing health and fitness, supplying energy, supporting growth and tissue repair, protecting against diseases, and regulating body functions.

📊 Diagram: No specific diagram in this section; introductory text and definitions are provided.

🔗 Connection: Leads into the detailed definitions of food, nutrition, nutrients, health, and fitness, setting the foundation for understanding balanced diets.

Frequently asked questions

Differentiate between the terms RDA and requirement.

RDA (Recommended Dietary Allowance) is the average daily intake level of a nutrient considered sufficient to meet the requirements of nearly all (97-98%) healthy individuals in a particular life stage and gender group. Requirement refers to the minimum amount of a nutrient needed to prevent deficiency symptoms in an individual. Thus, RDA is a recommended intake level for health maintenance, while requirement is the minimum needed to avoid deficiency.

Explain how the use of food groups simplifies planning of balanced meals.

Food groups categorize foods based on their nutrient content and function in the body, such as protective foods, energy-giving foods, and body-building foods. Using food groups helps in planning balanced meals by ensuring inclusion of all necessary nutrients from different groups, making meal planning easier and nutritionally adequate. It simplifies selection by focusing on variety and balance rather than individual nutrients.

List 10 foods which belong to the protective food group, stating reasons for your choice.

Protective foods are rich in vitamins and minerals that protect the body from diseases. Examples include: 1. Oranges - rich in Vitamin C 2. Spinach - rich in iron and Vitamin A 3. Carrots - rich in beta-carotene (Vitamin A) 4. Tomatoes - rich in Vitamin C and antioxidants 5. Guava - rich in Vitamin C 6. Broccoli - rich in Vitamin C and fiber 7. Papaya - rich in Vitamin C and folate 8. Apples - contain antioxidants and fiber 9. Cauliflower - rich in Vitamin C 10. Sweet potatoes - rich in beta-car

Discuss the factors that influence eating behaviour at adolescence.

Factors influencing eating behaviour at adolescence include:

  • Peer influence: Adolescents may choose foods to fit in with friends.
  • Media and advertising: Exposure to advertisements affects food choices.
  • Body image concerns: Desire to look a certain way may affect eating habits.
  • Availability and accessibility of food: Easy access to junk food can influence choices.
  • Family habits and culture: Family food preferences and traditions impact eating.
  • Emotional factors: Stress or mood swings

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