In addition, incompletely digested protein molecules can be released into the bloodstream causing allergic reactions. Lastly, because the stomach does not empty quickly, constipation ensues. Many people argue that a lot of foods contain both starch and protein. This is true. Dried beans or peas are the exception and should be avoided or soaked to render them starchless.
Fruits are a bit tricky as well.
Eat bananas, yellow pears, grapes, dates and figs with starch meals. All other fruits should be eaten with protein meals. You can also eat those on an empty stomach, and they will be digested in about 20 minutes. So, if you time things right, you can have fruit as an appetizer with a starch meal. Again, practitioners differ, and some proponents of food combining suggest eating fruit only in the morning on an empty stomach.