What happens to body fat in the diet?
When you go on a diet, you eat fewer calories than your body needs. Because of this deficiency, your body uses fat deposits for energy.
Your body needs to process fat deposits through a complex set of metabolic pathways.
The by-products of fat metabolism leave your body:
Just like the water that passes through the skin when you sweat and the kidneys when you urinate.
When you exhale, carbon dioxide passes through your lungs.
At the same time, the breakdown of fat releases energy for biological functions and physical activity, he said. It also produces heat to maintain a normal body temperature.
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What happens to body fat during exercise?
Your muscles first burn the stored glycogen for energy. After about 30 to 60 minutes of aerobic exercise, your body begins to burn fat first, says Dr. Burguera. If you exercise moderately, this should take about an hour.
Experts recommend at least 30 minutes of aerobic exercise 2 to 3 times a week.
They also recommend weightlifting and resistance training. Increasing muscle mass can help you burn more calories and increase your basal metabolic rate.
Exercise also increases your breathing rate, so that more carbon dioxide leaves your body when you exercise.
About exercise and weight loss
Exercise is the key to losing weight and maintaining it, says Dr. Burguera.
But it may take some time to move the numbers to the scales, so be patient.
Everyone’s response to exercise varies: some lose weight, others maintain it, and some may even gain a few pounds.
In general, however, people who lose weight successfully and maintain their weight tend to do up to an hour of physical activity a day, he said. A certain form of exercise 3 times a week is highly recommended.
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