2.4 - Healthy food

• Biologie
• Middelbare school
• vwo
• Leerjaar 2

2.4 - Healthy food

Today's lesson

1. Review HW Q8 pg. 122

2. Formative test

3. The wheel of five

4. Energy

5. Weight and BMI

6.  Eating disorders

7. Start BS 6 - Nutrition and digestion in mammals

HEALTHY FOOD

• Provides all the nutrients you need (carbohydrates, fats, protein, water, minerals & vitamins)
  
• Does not contain more energy than you need. 
• Does not contain a lot of sugar, fat & salt. 

Wheel of five

Energy

- most food is burned as fuel

-unit of energy is the Joule (j)

-1 kilojoule = 1,000 joules

-can also measure in calorie (cal)

- I kilocalorie = 1,000 cal

1 kcal = 4.2 kJ

Amount of energy 

-depends on gender, age, body size, exercise, climate, season

-examples:

1. sleeping = 4.2kJ per min
2. walking = 16.7 kJ per min
3. jogging = 29.3kJ per min
4. climbing stairs = 46.1 kJ/m

BODY MASS INDEX 

Are you in balance?

1. Overweight?
2. Underweight?

Eating disorders

Anorexia nervosa:  lose extreme amounts of weight

Bulimia nervosa:  vomit to get rid of the food, use large amounts of laxatives

Binge eating disorder: moments of eating a lot