What do beetles eat? Well, that is a very interesting and complex question. There really is not one single answer to that question. In order to better understand what the beetle eats, you are going to need to take the time to fully understand what type of beetle you are talking about. This is because there are numerous different types of beetles and each type is going to eat something different.It is interesting to understand how the mouth of the beetle works before you start to look at what they eat. If you have ever looked at a beetle up close you may have noticed that it looks like it has two little pinches in the front of its head. They are not really pinchers at all. They are actually teeth. They are used by the beetle to help them break their food apart and they help them chew their food. You should also know that they have four little fingers that are used to help the beetle shove its food into its mouth. It is amazing how the beetle seems to eat just like we do.