Consuming an orange daily could reduce depression risk by 20%, according to a Harvard Medical School and Massachusetts General Hospital study. Oranges promote the growth of gut bacteria that influence serotonin and dopamine production, which improves mood. The study suggests that including oranges in the diet may become part of depression treatment plans. Consuming an orange daily could reduce depression risk by 20%, according to a Harvard Medical School and Massachusetts General Hospital study. Oranges promote the growth of gut bacteria that influence serotonin and dopamine production, which improves mood. The study suggests that including oranges in the diet may become part of depression treatment plans. Health and Fitness, Health Tips, Exercises & Workout Tips, Diet & Wellness | Times of India Lifestyle