Metabolism

Metabolism is the amount of energy (calories) your body burns to maintain itself. Whether you are eating, drinking, sleeping, cleaning etc. your body is constantly burning calories to keep you going.

Metabolism is affected by your body composition. By body composition, I mean the amount of muscle you have versus the amount of fat. Muscle uses more calories to maintain itself than fat. People who are more muscular (and have a lower percentage of body fat) are said to have a higher metabolism than others that are less muscular. For example, let's say you have two people who are the exact same height and weight. One exercises on a regular basis with weights, in addition to aerobic exercise, and has a low percentage of body fat. The other never exercises and has a higher percentage of body fat. The first person that exercises will have a higher metabolism than the second person. What this basically means is that person number one's body will use more calories to sustain itself than person number 2.

To increase your metabolism you should begin to exercise and stop dieting. If you've never exercised before, make sure you see a doctor before beginning a new exercise program (your problems with metabolism may be the result of a medical condition rather than your diet or lack of exercise).

You can increase your muscle mass by doing some type of resistance work (i.e. lifting weights, using exertubes, rubber bands, dynabands, hand weights etc.). You can also decrease your level of body fat by doing some type of aerobic exercise at least 3 days a week for longer than 20 minutes. By aerobic exercise, I mean an activity (such as walking, jogging, step aerobics, hi/low aerobics, biking, swimming etc.) that will increase your heart rate into the target zone and keep it there for the duration of the exercise session. You also need to eat! - Do not diet; just watch the types of foods you eat. Try to eat a diet that is lower in fat (check the labels on the foods that you buy).

After the age of 30, your body gradually begins to lose it's muscle. If your activity level stays the same and the amount of calories you eat stay the same, you will gain weight because your metabolism has slowed down (you don't have as much muscle as you did in your 20's). If you exercise with weights and do some type of aerobic activity on a regular basis, you probably won't notice much of a change in your metabolism as you age.

Symptoms

...