1. Lesson 2: What Makes Up Our Food?

2. What makes up our food?
BEEF 1. 2. 3. …

3. What makes up our food? FATS
lipid molecule
1 glycerol
3 fatty acids

4. What makes up our food? CARBOHYDRATES
fiber
glucose
starch molecule

5. What makes up our food? PROTEIN

6. Comparing food molecules
CARBS:
GLUCOSE
LIPIDS
STARCH
All of these molecules have C-C and C-H bonds, which store chemical energy
PROTEIN

7. Comparing food molecules
CARBS:
4 kcal/gram
GLUCOSE
LIPIDS: 9 kcal/gram
STARCH
All of these molecules have C-C and C-H bonds, which store chemical energy
PROTEIN: 4 kcal/gram

8. Chemical energy in food
BEEF
Calories are a measurement of chemical energy in food
“chemical potential” E