I have followed the Fast 800 diet for twelve weeks and have lost one stone in weight( I need to lose maybe another 4 pounds) I am in my sixties and putting on weight is easy( despite being active and generally eaty healthily) I tried the app( I have previously used the WW app) but the Fast800 app just did not suit me, I think maybe it offers too much! I read the Fast800 book by Michael Moseley and two Fast800 recipe books and was hooked and loved the diet. The weight did not fall off as predicted but a steady 1-11/2 lbs per week. I will continue with this eating and two ‘fasting days’. The books suited me so much better than the app and thanks to them I feel I am back to my old self! Just hope I can stay there!