- a burger has a higher amount of calories then a carrot. Do you know how many calories would be a in burger? Carrot?
- carrot one medium=25 calories
- burger big mac from mcDonalds=485 calories
what is a calorie exactly?
- unit of energy
- unit of heat
- 4.184 Joules =1 gram calorie (based on one gram of water)
- 1 calorie is equal to 1 kilocalorie (kcal) or 1000 gram calorie (based on one kilogram of water)
- fats, carbs, protein and alcohol contain food energy
the differing energy densities of foods are shown in this table:
Food component | Energy Density | |
---|---|---|
Cal/g | kJ/g | |
Fat | 9 | 37 |
Ethanol (alcohol) | 7 | 29 |
Proteins | 4 | 17 |
Carbohydrates | 4 | 17 |
Organic acids | 3 | 13 |
Polyols (sugar alcohols, sweeteners) | 2.4 | 10 |
Salatrims (reduced energy fat) | 6 | 25 |
35000 calories =one pound
wow that seems like a lot! well what did you eat for thanksgiving? How many thanksgivings did you eat? How many xmas parties did you attend? Leftovers....you do the math it adds up.
a preliminary form of measuring calories is through the bomb calorimeter shown below. Its been shown that measuring calories through carbs, protein and fats is a more effective way to measure food energy.