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In a three month study, people suffering from major depressive disorder were recruited to join a study that investigates whether there is any effect of diet on their mental health. Past research has shown that there is an association between the quality of diets and risk of depression, however there has yet to be a randomized controlled trial to directly test a healthy diet's effect.
Any dietitian will encourage you to eat more of the following types of food: vegetables, fruits, fish, nuts, wholegrains. At the same time, though it is advised that people stay away from foods that are fried and processed or high in sugar, such as soda. The different effects of eating unhealthy and healthy food is not so much as in the weight of the individual, but the different vitamins and minerals you gain from what you eat. Nutrients from healthier foods can influence the chemicals in the body, which in turn affects the symptoms of major depressive disorder.
In addition, depression is also linked with an increase of physical illnesses like diabetes, hearth disease and obesity. Changing a patient's diet can also impact how suseptible he is to these linked illnesses.
Source material from PsyBlog