Eating on an empty stomach is not good. According to Query 39 Health Network, organic acids in peaches can promote gastric acid secretion. Eating peaches on an empty stomach for breakfast can cause symptoms such as acid reflux and stomachache, and indigestion can also lead to diarrhea and abdominal pain. Protein and carbohydrates should be properly supplemented for breakfast. protein foods such as milk, eggs and lean meat can provide enough energy for human body.