5. Mood changes
This effect, of course, varies greatly from person to person. Generally speaking, though, it’s not rare to experience certain feelings of anxiety and anger at the beginning, particularly if you’ve never fasted before. At this stage, it’s also quite common to feel tired, as the body begins to get used to food deprivation.
Gradually, a second state characterized by an improved lucidity and sense of comfort starts to settle. This stage usually takes place as the body’s metabolism starts to stabilize, particularly in long term fasting.