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Mental illnesses including depression, bipolar disorder and schizophrenia are risk factors for Type II Diabetes. Medications used to treat these conditions also carry the unfortunate side effects of weight gain and metabolic syndrome. A body with Metabolic syndrome and a depressed mind may have a reciprocal relationship through pathways involving insulin, fat tissue, and inflammation. One approach gaining traction in general medicine to treat metabolic syndrome is the Lower Carbohydrate Healthy Fat (LCHF diet), which focuses on modulating insulin response by lowering carbohydrate intake in order to prevent weight gain and facilitate weight loss. This differs from previous low fat/low calorie dietary dogma. The premises and misconceptions of the LCHF diet, as well as recent literature debunking the harms of fat consumption will be reviewed. Mental Health Professionals can consider potential applications of this intervention to our patient population for metabolic management. Similarly, while the most recent CANMAT Depression guidelines do not address diet, recent studies have suggested that dietary interventions similar to the LCHF diet can improve symptoms of depression. Both physician and patient barriers to providing and following dietary advice will be explored. In spite of these, advising an LCHF diet to psychiatric patients carries little risk of harm and potential for significant benefit.