10 Symptoms of Premenstrual Syndrome

7. Depression

Like we've said, estrogen and progesterone affect the balance of other hormones in the body. One of those hormones is serotonin. It is tasked with regulating our emotions. A lack of it causes a significant drop in the mood department. All your thoughts tend to focus on the negative side of things. If you want to battle this lack of serotonin, make sure to eat a lot of protein. You can basically reverse the mood-altering effects by countering the hormonal imbalance. The best way to do this is through quality protein sources. Eggs, nuts and various kinds of fish fit the bill perfectly.