Recurring depressive episodes reduce the size of your hippocampus, a brain area involved in forming emotions and memory; a smaller hippocampus equates to a loss of emotional and behavioral function
Chronic inflammation may be the most important underlying risk factor for depression, and virtually all effective treatments for depression also address inflammation
Key treatment strategies include trading processed foods for real food, with an emphasis on fermented foods to optimize your gut flora, exercise, and optimizing your vitamin D by getting appropriate sun exposure