Diet and Energy

What can cause weight gain and loss?

An energy imbalance

Weight gain - energy intake is greater than energy output, so excess energy is turned into fat reserved in the body

Weight loss - energy intake is lower than energy output, so fat reserves are turned into energy

When can someone become over or underweight?

If the energy imbalance is sustained over a long period of time

What is the recommended calorie intake for women and men?

2000 for women

And 2500 for men

energy budget and the equation

Energy input - energy output = energy budget

Vitamin C Practical

Uses: DCPIP that turns from blue to colourless when in the presence of vitamin C

1. Use several vitamin C solutions of known concentration

2. Using a measuring cylinder measure equal volumes of DCPIP and add them into test tubes

3. Add one of the vitamin C solutions drop by drop into the DCPIP solution

4. After each drop shake the DCPIP solution for a set length of time using a stopwatch

5. Record when the solution turns colourless (number of drop)

6. Repeat 2 more times with the same concentration of Vitamin C

7. Repeat with all the other Vitamin C solutions of different concentrations

8. Plot a graph of volume of Vitamin C on the concentration of vitamin C

9. Draw a curve of best fit = calibration curve

10. Test unknown solutions and record the number of drops needed and compare to the graph