I fasted for 2 weeks. Only water, tea (no sugar or milk) and a tiny bit vitamins just for safety. I actually loathed going back to eating. At a point I thought

I fasted for 2 weeks. Only water, tea (no sugar or milk) and a tiny bit vitamins just for safety. I actually loathed going back to eating. At a point I thought it strange that I am actually dragging switching back to eating -- before the experiment I thought I will be looking forward to it. I have fasted many times before and after, though no longer than a week. I think it is easier to fast if you are already doing something like intermittent fasting and are used to skipping whole days of eating. My experience is that the worst is 2nd and 3rd days of fast, it gets better after that and about a week later headaches stop and you are feeling light and slightly energized. I will not repeat fasts over 1 week in length again as I have some data to suggest that my muscle mass and physical fitness decreased due to that fast. So if you are looking to loose weight by going radical fast you need to be mindful you can be loosing muscle mass that is really important to burning energy, and this could undo any benefits. I think if you are very, very overweight and very, very determined you could use this as a drastic measure with intention to build the muscle mass back after you finish fasting. On the other hand shorter fasts (1-3 days), though not so enjoyable, don't seem to be leaving any lasting harm (for me) and over time you get used to it and can control calorie intake better.