If I recall correctly there are some conditions where diet will have such effects, but they depend on genetics and random bad luck. So I call mostly bullshit. T

If I recall correctly there are some conditions where diet will have such effects, but they depend on genetics and random bad luck. So I call mostly bullshit. The body will not burn muscle, at least in a healthy human, unless near death due to starvation. The body can however adapt to what you eat and get better at converting to energy with the help of bacteria. The muscles hold water, fuel and fat, so they will look smaller when all is depleted.