One of the reasons it's so difficult to study the relationship between diet and disease is because many dietary behaviors are associated with non-dietary behaviors.

The Iowa Women's Health Study, which has followed more than 35,000 women for decades, found eating more broccoli, cauliflower, kale and other cruciferous vegetables was associated with a lower risk of getting non-Hodgkin's lymphoma in the first place.

The benefits of a healthier diet are far-reaching because they also equate to fewer animals being bred into inhumane factory farm conditions and fewer greenhouse gas emissions.

Despite the growing evidence of health benefits associated with coffee consumption, I still don't recommend my patients drink it - not because it's not healthy, but because there are even healthier choices.

Steven came in with some difficult behaviors,

Berries are the healthiest fruit, offering potential protection against cancer and heart disease, boosting the immune system and acting as a guard for the liver and brain.