A healthy minimum body fat percentage for women is 10% and for men around 5%. Body fat percentages much lower than those are unhealthy and dangerous and if they get too low, you're at risk of becoming sterile (can't have children).
The minimum amount of body fat considered too low for optimal health and functioning is around 5-10 for men and 10-15 for women.
I believe the minimum is 2-5% body fat for males. It is more for females. This is the very minimum you would ever want to have, any less is unhealthy. I think the only way to achieve this low body fat is to be a serious weight-lifter, as that would increase your mass without increasing fat lowering the percentage. I'm fairly certain its impossible for anyone else.
Any fat you have is more weight for your body to carry. Any muscle you have is helping you carry the fat. You definitely need to have some fat so prevent you from burning muscle, but the more fat you have, the harder it is to carry it around, making you more tired. In any sport, it is most beneficial to get less tired.
Men and Women have different minimums for body fat percentage. For a man anything below 5% body fat is unsafe. For a woman the minimum is 12%. Evidence suggests that there's no real benefit for going below 8% for men or 14% for women.
To calculate the percentage of body fat loss, you can use the formula: (Initial body fat - Current body fat) / Initial body fat x 100. This will give you the percentage of body fat lost.
You will definitely not lose weight because you body will hold on to the fat and use only the minimum to be able to survive the longest.
You can get your body fat measured at a gym, health clinic, or with at-home body fat scales.
If you had no body fat, you would die. Everybody has (and needs!) body fat.
You should consider your fat tissues as your body fat.
Lean Body Fat
The body stores fat to save energy for when the body needs it. It also uses fat to regulate the body temperature.
I think it's fat in your body