Scientists are finding that when it comes to nutrition, the mind and body are linked far more intimately than previously believed. Recent studies have found that eating unhealthy foods, especially those high in sugar and fat, contribute directly to the biological and emotional states associated with depression. When we eat poorly, our body understands a lack of nutrients to be the consequence of a disease. In response, it releases proteins that attempt to combat the perceived intruder and cause subtle inflammation (similar to the swelling of a healing wound).
One study focused on a southern European population that slowly transitioned from the Mediterranean diet–rich in oils, vegetables, and nuts–to a western diet containing more sugar and fat.
Many initiatives are currently underway to treat depression with healthier diets, including a trial program by the Defense Department that delivers nutrient rich foods to soldiers diagnosed with PTSD. In other cases, eating a healthy diet has proved to be an effective preventative measure against developing depression–as effective as preventative mental health counseling!
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In his Big Think interview, fiction writer and animals rights advocate Jonathan Safran Foer explains that the environmental cost of one fast-food hamburger is $500, even though we may only pay $5 cash for it.