Health: The Ultimate Treasure — Class 8 Science (Curiosity)

"Health is the greatest gift, contentment the greatest wealth, faithfulness the best relationship." — The Buddha

1. About the Chapter

This chapter teaches you that health is your most valuable possession. You'll learn:

• Components of a balanced diet (carbs, proteins, fats, vitamins, minerals)
• Deficiency diseases and their prevention
• Hygiene practices (personal and food)
• Physical and mental fitness
• Sleep, exercise, posture
• Indian wellness traditions (yoga, Ayurveda)

The WHO Definition

Health is "a state of complete physical, mental, and social well-being, and not merely the absence of disease."

This means:

• Physical — body works well
• Mental — mind is calm and clear
• Social — good relationships, role in society

All three matter.

2. Components of a Balanced Diet

Carbohydrates (Energy)

• Main fuel for the body
• Sources: rice, wheat, jowar, bajra, potato, bread, sugar
• Recommended: 55-60% of daily calories

Proteins (Body building)

• Build muscles, tissues, enzymes
• Sources: pulses (dal), beans, milk, paneer, eggs, fish, meat, soybean
• Recommended: 10-15% of daily calories
• Children and growing teens need MORE protein

Fats (Concentrated energy)

• 9 calories/gram (more than carbs and proteins)
• Sources: ghee, butter, oils, nuts, seeds
• Recommended: 20-30% of daily calories
• Too much causes obesity, heart disease

Vitamins (Tiny but vital)

Needed in small amounts; deficiency causes specific diseases.

Minerals

Essential elements needed for various body functions.

Water

• 60% of body weight is water
• Recommended: 8 glasses (2 litres) per day
• More if hot weather or exercising
• Dehydration → headache, fatigue, kidney issues

Roughage (Fibre)

• NOT digested, but ESSENTIAL
• Helps in bowel movement
• Sources: whole grains, salad, fruits with skin
• Deficiency → constipation, colon problems

3. Deficiency Diseases (Detailed)

Scurvy

• Caused by: Vitamin C deficiency
• Symptoms: bleeding gums, swollen joints, weak immunity
• Cure: lemons, oranges, amla
• History: killed many sailors before lemons were discovered as cure

Rickets

• Caused by: Vitamin D deficiency (especially in children)
• Symptoms: bow legs, soft bones
• Cure: sunlight (body makes vit D in skin), fortified milk, eggs

Anaemia

• Caused by: Iron deficiency (or B12, folate)
• Symptoms: weakness, pale skin, breathlessness
• Cure: green leafy vegetables, jaggery, meat, iron supplements
• In India: 50% of women are anaemic — major health issue

Goitre

• Caused by: Iodine deficiency
• Symptoms: swollen thyroid gland (neck)
• Cure: iodised salt (compulsory in India)

Kwashiorkor & Marasmus

• Caused by: protein deficiency (kwashiorkor) or general malnutrition (marasmus)
• Symptoms: swollen belly, weak muscles, stunted growth
• Common in: undernourished children in poor regions

Night Blindness

• Caused by: Vitamin A deficiency
• Symptoms: poor vision in low light
• Cure: carrots, papaya, fish liver oil

4. Personal Hygiene

Daily Practices

• Brush teeth twice a day
• Bath daily with soap
• Wash hands before eating and after toilet
• Cut nails weekly
• Wash hair regularly
• Clean clothes daily

Food Hygiene

• Wash fruits and vegetables before eating
• Cover food to prevent flies/insects
• Eat freshly cooked food
• Refrigerate leftovers
• Don't eat from unclean places

Environmental Hygiene

• Keep home and surroundings clean
• Dispose of garbage properly
• No water stagnation (mosquito breeding)
• Use clean drinking water

5. Exercise

Benefits

• Strengthens heart and lungs
• Builds muscles and bones
• Improves mood (releases endorphins)
• Maintains healthy weight
• Better sleep
• Reduces stress

Recommended

• At least 60 minutes of physical activity per day for children/teens
• Mix of: aerobic (running, cycling), strength (sit-ups), flexibility (stretching)

Common Activities

• Outdoor games (cricket, football, badminton, kabaddi)
• Cycling, swimming, jogging
• Yoga, dance
• Walking

India's Tradition

• Yoga — ancient Indian practice combining physical postures (asanas), breathing (pranayama), meditation
• International Yoga Day: 21 June

6. Sleep

Why Important

• Body repairs and grows during sleep
• Brain consolidates memories
• Immunity strengthens
• Hormones balanced

How Much

• Teens (8-12 years): 9-12 hours
• Teens (13-17 years): 8-10 hours
• Adults: 7-9 hours

Sleep Hygiene

• Fixed bedtime and wake time
• No screens 1 hour before bed
• Dark, quiet, cool room
• No heavy meals or caffeine before bed

7. Mental Health

What It Means

Mental health = emotional + psychological + social well-being.

Importance

A healthy MIND is as important as a healthy BODY.

How to Maintain

• Express emotions — talk to family, friends
• Manage stress — meditation, hobbies, exercise
• Stay connected — friendships, family time
• Avoid bullying — both as bully and bullied
• Sleep well
• Eat well (food affects mood)
• Seek help when needed (parents, teachers, counsellors)

Common Issues

• Stress (exam pressure)
• Anxiety
• Depression
• Loneliness

Indian Tradition

• Pranayama (breathing exercises) calms the mind
• Meditation (dhyana) increases focus
• Yoga combines both

8. Bad Habits to Avoid

Drugs and Substances

• Tobacco (cigarettes, gutkha) → cancer, heart disease
• Alcohol → liver damage, addiction
• Drugs → addiction, brain damage, social ruin
• These are ESPECIALLY harmful in teens (developing brain)

Junk Food (in excess)

• High sugar, salt, fat
• Causes obesity, diabetes, heart problems
• Examples: chips, soda, fried food, sweets

Sedentary Lifestyle

• Too much screen time
• No outdoor play
• Causes obesity, weak muscles, poor posture

Poor Posture

• Hunching over phones/laptops
• Causes back pain, headaches
• Sit straight, take breaks

9. Indian Wellness Traditions

Ayurveda

• 3000+ year-old system of medicine
• Focus on balance of three 'doshas' (Vata, Pitta, Kapha)
• Uses herbs, oils, diet, lifestyle
• Modern science increasingly studying ayurvedic herbs

Yoga

• Originated in India ~3000 BCE
• Physical postures + breathing + meditation
• Practised globally today
• International Yoga Day: 21 June

Naturopathy

• Treatment using natural methods (sunlight, water, fasting)
• No medication

Siddha

• South Indian system of medicine
• Tamil Nadu, Kerala

10. Common Mistakes

1. Skipping breakfast

   • Most important meal; missing it reduces concentration

2. Junk food as main diet

   • High calorie, low nutrition → obesity + deficiencies

3. Not drinking enough water

   • Causes fatigue, headaches, poor skin

4. Sleeping late, missing morning routine

   • Disrupts hormonal balance, mental clarity

5. Sedentary lifestyle

   • Cause of childhood obesity, lifestyle diseases

11. India's Health Challenges

Major Issues (2026)

• Anaemia — 50% women, 30% children
• Childhood obesity — rising in urban areas
• Tobacco use — causes 30% of cancers
• Diabetes — 70+ million Indians
• Hypertension — 30% of adults
• Mental health — growing awareness

Government Programmes

• Mid-Day Meal Scheme — nutritional support to school children
• Iodised salt — compulsory to prevent goitre
• Universal Immunisation Programme
• POSHAN Abhiyan — nutrition mission
• Ayushman Bharat — health insurance for 50 crore Indians

12. Conclusion

Health truly IS the ultimate treasure. Without it, no amount of wealth, fame, or success means anything. As a Class 8 student in 2026, you are in the prime of life — establish habits NOW that will sustain you for decades:

• Eat a balanced diet (carbs, proteins, vitamins, minerals)
• Drink enough water (2 litres/day)
• Exercise daily (60 minutes)
• Sleep enough (8-10 hours)
• Practise hygiene (handwashing, bathing)
• Care for your mind (talk, meditate, connect)
• Avoid drugs, tobacco, junk food
• Use India's traditions (yoga, ayurveda)

Your future self — at 30, 50, 80 — will thank you for the choices you make today.