Its simple metabolism. Your body burns the fat molecules that are in your body for energy and ATP to drive cellular processes.
When you starve yourself, your body does not have much to run on (food and drinks provide energy for the body). To get energy, it uses stored energy in fat cells. The body begins to metabolize these cells, and you lose fat.
Caloric intake and physical activity are key factors in gaining or losing weight. Consuming more calories than the body uses will lead to weight gain, while consuming fewer calories than the body needs will result in weight loss. Regular exercise can help burn calories and improve overall health.
Brooming is a light exercise that uses a lot of muscles which burns up some energy, reducing weight.
To keep your body healthy and at correct weight
Respiratory system
Respiratory system
nutrition
digestion
Respiration
When you do your work out , you do not gain weight , your body uses it to build muscles.
Weight loss
The human brain uses approximately 1/4 of the body's energy, while comprising about 2% or less of its weight.