re: Study: fasting results in complex metabolic changes

You just have to start at 16 hours and go from there. Been doing it 6 months and its life changing. The first time I did it I ate and was almost sick and I couldnt eat for almost 18-20 hours and that's how I started. The first week or 2 were hard but it got easier. Now I do 24 hours a day almost every single day and 42-48 hours 1 day a week. You have to become fat adapted to keep you full longer and also get plenty of sleep.