Diet, Growth and Body Movement
Understanding Nutrition and Health Exploring Body Systems Grade 7 Science
The Six Essential Nutrients
Proteins - building blocks for growth and repair Carbohydrates - main source of energy Fats and oils - energy storage and insulation Vitamin A - healthy vision and immune system Vitamin C - wound healing and iron absorption Vitamin D - strong bones and teeth
Essential Minerals and Water
Water - makes up 60% of our body weight Iron - carries oxygen in red blood cells Calcium - builds strong bones and teeth These minerals work together with vitamins Water helps transport nutrients throughout the body
Foods Rich in Each Nutrient
{"left":"Proteins: meat, fish, eggs, beans, nuts\nCarbohydrates: bread, pasta, rice, potatoes\nFats: avocados, olive oil, nuts, butter\nVitamin A: carrots, spinach, sweet potatoes","right":"Vitamin C: oranges, strawberries, broccoli\nVitamin D: salmon, fortified milk, sunlight\nIron: red meat, spinach, lentils\nCalcium: milk, cheese, yogurt, leafy greens"}
What Makes a Balanced Diet?
Think about your meals yesterday Did you include foods from all nutrient groups? What does 'balance' mean in nutrition?
Why Different People Need Different Diets
Growing teenagers need more calories and protein Athletes require extra carbohydrates for energy Older adults may need more calcium and vitamin D Too much sugar can lead to tooth decay and weight gain Excess fats can cause heart problems over time
Growth, Development and Health
Growth - increase in size and weight Development - gaining new abilities and skills Exercise strengthens muscles and bones Physical activity improves heart and lung function Regular movement helps maintain healthy weight
The Dangers of Smoking
Smoking contains over 4,000 harmful chemicals Nicotine is highly addictive Tar damages lungs and causes cancer Carbon monoxide reduces oxygen in blood
How Muscles Move Your Arm
Feel your bicep as you bend your arm Notice how it contracts and gets harder Now straighten your arm - feel your tricep Biceps and triceps work as antagonistic pairs When one contracts, the other relaxes
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