Fat is a nutrient. It is crucial for normal body function and without it we could not live. Not only does fat supply us with energy, it also makes it possible for other nutrients to do their jobs.
When body accumulates excess fat to the extent that it may have a negative effect on health, leading to reduced life expectancy and/or increased health problems. This condition is called obesity. usually obesity is due to positive energy balance. That is, the intake of calories is more than the expenditure of calories.
Not all body fat is bad, but excess body fat can be a problem. Too much fat in the body is connected to many health conditions such as heart disease and hardening of the arteries.