You gain fat ten times faster than humans can naturally gain, and easily becomes obese. The fatter you are, the more physically stronger you become. You do not suffer from health problems related to obesity. You can choose to burn your fat, resulting in a temporary boost to stamina and strength proportional to the amount of fat lost. You body will adjust to the lack of fat, making sure you don’t have loose skin.
Big Boy
You can endlessly gain fat, allowing for a greater boost in stats. You gain a pocket dimension where you can store excess fat. Due to storing the excess fat, you will not change in appearance and weight pass a certain level of obesity.