Raisins are a variety of grapes, which are as rich in fructose and glucose as grapes, so the taste is very good, and there is no problem eating them on an empty stomach, because it is part of the energy given to us when we lack energy during fasting. But it is not easy to consume too much, because it is after all a fruit, the fruit contains fiber pectin and cellulose, these things are a stimulus to the gastrointestinal tract. Some people with a weak spleen and stomach may eat fruit on an empty stomach will lead to a diarrhea or stomach discomfort, so when fasting try to eat some cereal, like porridge, soup, these, neutralize the stomach acid.