Nutrition is definitely important, but a believer can also seek spiritual power. Spiritual power can sometimes have amazing results. While the Imams would eat a little, their spirituality and conviction gave them great powers.
Having said that, here are some recommendations for one’s diet:
1- Never overeat. Stop eating when you are not full yet. Making one’s stomach full is very discouraged. It weakens one’s spirituality.
2- Don’t eat meat everyday, but don’t skip meat as well. Lamb is the most recommended type of meat. Eating it once or twice a week is good.
3- Skip a meal. For example, have breakfast, then make your next meal dinner. Then your next meal a late lunch, then the next one breakfast, and so on.
4- Eat dates, squash, pumpkin, grapes, fig, and quince (highly recommended). Eating
5- Don’t sleep on an empty stomach. Eat something even if it’s a small bite, like one piece of date.
6- Eating greens