Calorimetry

1
Calorimetry

• Calculating Calories

2
Calorie

• A measure of the amount of energy in food
• Big Mac 540 Calories LOTS of energy available

3
Calories Fat???

• No.
• Calories Energy
• Too many Calories More energy than your body
  needs Stored as Fat
• 3500 Calories 1 pound of fat

4
Exercise Fat

• 100 Calories About 1 mile on foot
• How many miles must you travel to burn of 1 pound
  of fat?
• 35 miles
• Walk 1 mile a night
• 1 month 1 pound (of fat) loss
• 1 year 12 pounds (of fat) loss

5
Weight Loss Pills

• Fast fat loss?
• NO WAY!!!
• Main ingredient caffeine
• Diuretic
• Weight loss WATER!

6
Diet Fat

• 2000 Calories used (burned)
• Only 1900 eaten
• 100 Calories your body needed but didnt get.
  Uses fat reserves.
• 100 Calories 1 piece of bread
• After 1 month 1 pound lost
• After 1 year 12 pounds lost

7
Diet Exercise

• 100 fewer calories
• 100 extra used up w/exercise
• 200 per day
• 1 month 2 pounds
• 1 year 24 pounds
• Small gradual changes accumulate to big changes
  overall.
• Healthy weight loss slow!

8
Lab calorie

• Energy needed to raise the temperature of 1 g H2O
  by 1?C.
• 1 g H2O 1 mL H2O
• If you raise 10 g H2O 10?C, then
• 10 lab calories
• Lab calories calories with lowercase c

9
Lab calorie

• Lab calorie ?t x (grams H2O heated)
• Grams H2O mL H2O
• Lab calorie (tmax-tstart) x (amount water
  heated)

10
Food Calorie

• Food Calorie is what you see on food labels
• Calorie with CAPITAL C
• 1 Food Calorie 1000 lab calories
• 1000 lab calories 1 kilocalorie (kcal)
• Calorie kilocalorie kcal 1000 lab calories

11
Converting lab calories to kcals

• Kcal lab calorie
• 1000

12
Account for differences in size of food sample

• Kcals per 1 gram of food
• Kcal
• ?m
• Kcal/(mstart mend)

13
When finished with math

• See how close you were!
• Go to www.nutritiondata.com
• 1st EMO link on Ms. Hardels web page
• Look up each food from lab.
• Calculate kcals/gram
• Write actual kcals/gram in the box on your data
  table.