Depression's Upside Is there an evolutionary purpose to feeling really sad?

Processed food link to depression: research A diet heavy in processed and fatty foods increases the risk of depression, according to a new study. Researchers found that a diet including plenty of fresh vegetables, fruit and fish could help prevent the onset of depression. Taking into account other indicators of a healthy lifestyle such as not smoking and taking physical exercise, those who ate the whole foods had a 26 percent lower risk of depression than those...