Eat more carbohydrates (grains, vegetables, fruits) before running, which is actually commonly known as sugar, so as to bring more energy and motivation to exercise. But to eat less fat and protein, which can only increase the burden for no reason and consume little energy.
Don't eat before 2 hours before running. That is, when you run, you have everything in your stomach and you won't feel uncomfortable when you run. And don't eat spicy food, such as Chili, which will upset your stomach when you run.