There are 3 types of people.
Naturally slim individuals. These people lose fat easily, but it is hard for the to gain muscle mass.
- Losing weight rapidly can work against you in the long run. When you lose more than 2-3 pounds in one week, that weight loss is most definitely fat and muscle. This rapid weight loss will decrease your lean mass percentage which will also decrease the rate at which your body burns calories. Losing 1-2 pounds a week is considered healthy weight loss and will result in, if weight lifting consistently, only fat loss.