400 pound fuck survives fasting for over a year (peer-reviewed research study) This fat fuck survived over A YEAR without food. He did require potassium supplementation at one point. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2495396/ This is an older paper and no ethics committee would approve a study like this today, but it proves a powerful point. The human body can survive without food for days, weeks, even years if you have an excess fat reserve. It's probably not healthy and it probably increases advanced glycation endproducts in the body, but going without food isn't a death sentence for most people who are overweight or fat. Starvation mode is a lie. The human body evolved in an environment where days, maybe even WEEKS, went by without food.  https://en.wikipedia.org/wiki/Starvation_response You will lose some protein when fasting, but you don't enter true starvation mode UNTIL your body has used up all its fat reserves. Which can take a LONG time for some people.