If ketosis is a goal for you, fasting for about 2.5 to 3 days usually results in you reaching that state. Then, if you start eating a ketogenic diet, you will typically stay there. Decreases the transition period for ketosis.
Another benefit is the autophagy. When cells are provided with nutrients, they multiply and divide and proliferate. This includes viruses and bad bacteria and even cancer cells. When they are deprived of nutrients, cells die off. Yes, some healthy cells will go the way of the wind, but normally, when deprived of nutrients, the body will work to preserve healthy cells and prefer to kill off weak or damaged cells. This can have an amazing impact on detoxifying the body, helping to rid the body of disease, and lowering inflammation. Longer-term fasts are typically required for much autophagy to occur though.
And of course, fat loss doesn't just STOP after a certain amount of hours.
