Is 100 calories enough per day?

Answer 1

Yes, but only if you are planning a very painful, slow death. 500 a day will end a persons life probably within a years time. The average person needs 1500 too 2300 a day too maintain current body composition. There are plenty of healthy ways loose weight and become healthy. Starvation is NOT one of them, and will actually force your body to store fat instead of muscle.