Being overweight as a result of muscle gain in many physically fit people is healthy. However, being overweight as a result of too much body fat is dangerous to one's health. Overfat people are more likely to develop heart disease and stroke. Excess weight caused by fat increases strain on the heart.
Obese people have a higher than normal risk for a heart attack.
The percentages of fat, muscle, and bone in the body provide an overall view of your health and fitness in relation to your weight, health, and age. The average healthy body fat range for men is 13-17 percent. For women, the average healthy range is 20-27 percent. General health and heart risks increase when body fat exceeds these ranges. Obesity is defined by a body fat level above 25 percent for men and above 31 percent for women.