It's no secret that the unhealthy American Diet is contributing to an epidemic of obesity. But there's another hidden epidemic that our fatty diets are at the root of: a national Libido crisis.

One of the big culprits, for both men and Women, is obesity. As a person's weight soars, their libido plummets, due to biochemical changes that diminish blood flow. Extra weight also hinders their ability to have children—with men, it's damaged sperm; with women, it's ovulation problems. (Manage your weight with more than just Food intake: Try these downloadable fitness plans.)

The good news: With some simple changes to your diet, courtesy of the latest research from Eat This, Not That!, you can revitalize your relationship and dramatically improve your health.