Central Nervous System

A study published in the journal Public Health Nutrition showed that eating commercial baked goods (doughnuts, croissants, and, yes, even bran muffins) and fast food (pizza, hamburgers, and hot dogs) may be linked to depression. The study determined that people who eat fast food are 51 percent more likely to develop depression than those who eat little to no fast food. It was also found that the more fast food study participants consumed, the more likely they were to develop depression.

A junk food diet could also affect your brain’s synapses and the molecules related to memory and learning, according to a study published in the journal Nature. Animal tests have shown a similar effect. Rats fed a steady diet with over half the calories from fat (similar to a junk food diet) for just a few days had trouble completing a maze they had previously mastered in a 2009 study.