It also depends on the type of fat. People with high density fat (like me) can be 100 pounds overweight (or more), and still be negatively buoyant. I have to wo

It also depends on the type of fat. People with high density fat (like me) can be 100 pounds overweight (or more), and still be negatively buoyant. I have to work to stay afloat. My wife has low density fat, and she can't sink or dive for love or money.