Food and Nutrition – Nutrient and Nutrition Basic 4 Home Economics Lesson Note

What is Nutrition?

Nutrition is the process of eating the right foods in the right amounts to keep our body healthy, strong, and growing properly.

What are Nutrients?

Nutrients are the useful substances found in food that our body needs to grow, stay healthy, have energy, and fight diseases.

The 6 Main Nutrients

1. Carbohydrates

The body’s main source of energy

What They Do:

• Give energy: Power for running, playing, thinking
• Fuel for brain: Help us concentrate and learn
• Body fuel: Like petrol for a car

Food Sources:

• Grains: Rice, bread, wheat, oats
• Root crops: Yam, cassava, sweet potato, Irish potato
• Fruits: Bananas, plantains
• Others: Honey, sugar

Signs of Deficiency:

• Feeling tired and weak
• Unable to concentrate
• No energy for activities

2. Proteins

The body building nutrients

What They Do:

• Build muscles: Make us strong
• Repair body: Fix damaged tissues
• Growth: Help children grow taller
• Fight disease: Make antibodies to fight germs

Food Sources:

• Animal proteins: Meat, fish, chicken, eggs, milk
• Plant proteins: Beans, groundnuts, soybeans
• Others: Cheese, yogurt

Signs of Deficiency:

• Slow growth in children
• Weak muscles
• Wounds heal slowly
• Getting sick often

3. Fats and Oils

Concentrated source of energy and essential nutrients

What They Do:

• Energy storage: Store energy for later use
• Insulation: Keep body warm
• Protect organs: Cushion important body parts
• Vitamin absorption: Help body use some vitamins

Food Sources:

• Plant oils: Palm oil, groundnut oil, coconut oil
• Animal fats: Butter, meat fat
• Others: Avocado, nuts, seeds

Signs of Deficiency:

• Dry skin and hair
• Feeling cold easily
• Lack of energy
• Poor vitamin absorption

4. Vitamins

Special nutrients that help body work properly

Main Vitamins:

Vitamin A:

• Function: Good eyesight, healthy skin
• Sources: Carrots, spinach, liver, eggs, mangoes

Vitamin C:

• Function: Fight diseases, heal wounds
• Sources: Oranges, tomatoes, pepper, guava

Vitamin D:

• Function: Strong bones and teeth
• Sources: Sunlight, fish, eggs, milk

B Vitamins:

• Function: Energy production, healthy nerves
• Sources: Whole grains, meat, beans, leafy vegetables

Signs of Deficiency:

• Vitamin A: Night blindness, dry eyes
• Vitamin C: Slow wound healing, getting sick often
• Vitamin D: Weak bones, tooth problems

5. Minerals

Essential substances for body functions

Important Minerals:

Calcium:

• Function: Strong bones and teeth
• Sources: Milk, cheese, leafy vegetables, fish with bones

Iron:

• Function: Healthy blood, prevent anemia
• Sources: Meat, beans, spinach, liver

Iodine:

• Function: Proper growth and brain development
• Sources: Iodized salt, fish, seaweed

Signs of Deficiency:

• Calcium: Weak bones, tooth decay
• Iron: Tiredness, pale skin, anemia
• Iodine: Slow growth, learning problems

6. Water

The most important nutrient

What It Does:

• Transport: Carries nutrients around body
• Temperature control: Keeps body cool through sweating
• Waste removal: Helps remove waste through urine
• Joint lubrication: Keeps joints moving smoothly
• Cell function: All body cells need water to work

How Much Needed:

• Children: 6-8 glasses per day
• More needed: During hot weather, exercise, illness
• Sources: Plain water, fruits, vegetables, soups

Signs of Dehydration:

• Feeling thirsty
• Dark yellow urine
• Headaches
• Tiredness

Functions of Nutrition

1. Growth and Development

• Physical growth: Getting taller and bigger
• Brain development: Becoming smarter and learning better
• Organ development: All body parts grow properly
• Bone strength: Strong skeleton to support body

2. Energy Production

• Daily activities: Energy for walking, playing, studying
• Body functions: Energy for heart beating, breathing
• Brain power: Energy for thinking and concentrating
• Muscle work: Power for all movement

3. Body Repair and Maintenance

• Healing wounds: Fix cuts and injuries
• Replace old cells: Body constantly makes new cells
• Maintain organs: Keep all body parts working well
• Fight wear and tear: Repair daily damage

4. Disease Prevention

• Strong immune system: Fight off germs and infections
• Prevent deficiency diseases: Avoid malnutrition problems
• Antioxidant protection: Protect cells from damage
• Overall health: Stay healthy and feel good

5. Body Regulation

• Temperature control: Keep body at right temperature
• Blood sugar control: Maintain energy levels
• Hormone production: Make chemicals body needs
• pH balance: Keep body chemistry right

Balanced Diet

What is a Balanced Diet?

A balanced diet contains all the nutrients in the right amounts that our body needs each day.

Components of Balanced Diet:

• All 6 nutrients: Carbohydrates, proteins, fats, vitamins, minerals, water
• Right proportions: More of some nutrients, less of others
• Variety: Different types of foods
• Regular meals: Eating at proper times

Benefits of Balanced Diet:

• Proper growth: Children grow normally
• Good health: Less likely to get sick
• Energy: Feel active and strong all day
• Mental alertness: Think clearly and learn well

Signs of Good Nutrition:

• Healthy appearance: Bright eyes, clear skin, shiny hair
• Good energy: Active and alert throughout day
• Normal growth: Growing at expected rate
• Strong immunity: Don’t get sick often

Signs of Poor Nutrition:

• Poor appearance: Dull eyes, rough skin, thin hair
• Low energy: Tired and weak often
• Slow growth: Not growing as expected
• Frequent illness: Getting sick regularly

EXERCISES

Exercise 1: Fill in the Blanks

1. ________ is the process of eating right foods to stay healthy
2. ________ are useful substances found in food that our body needs
3. ________ give us energy for daily activities
4. ________ help build and repair our muscles

Exercise 2: True or False

1. All foods contain the same nutrients ____
2. Carbohydrates are the body’s main source of energy ____
3. We need only one type of nutrient ____
4. Water is not an important nutrient ____

Exercise 3: Match Nutrients with Functions

Draw lines to connect each nutrient with its main function:

• Carbohydrates → Building muscles and repairing body
• Proteins → Giving energy for activities
• Vitamins → Keeping body temperature right
• Water → Helping body work properly

Exercise 4: Nutrient Sources

Write “C” for Carbohydrates, “P” for Proteins, “F” for Fats, “V” for Vitamins, or “M” for Minerals:

1. Rice ____
2. Fish ____
3. Palm oil ____
4. Oranges ____
5. Milk ____

Exercise 5: Choose the Right Answer

Circle the correct answer:

1. Proteins help with: Giving energy / Building muscles
2. Vitamin C is found in: Meat / Oranges
3. Calcium makes: Bones strong / Muscles strong
4. Water helps: Remove waste / Build muscles

Exercise 6: Food Sources

List 3 food sources for each nutrient:

1. Carbohydrates: ________, ________, ________
2. Proteins: ________, ________, ________
3. Vitamins: ________, ________, ________