A University of Grenada publication in Public Health Nutrition revealed that consumers of fast foods and baked sweets were 50% more likely to be depressed than those eating a healthy diet. These same people, however, were also likely to be single, less active physically, worked more than 45 hours a week, and smoked. A previous study showed a 42% increase in depression, so the numbers are reasonably close. There is also data showing that certain foods protect against developing depression. They include B vitamins, omega 3 fatty acids, and olive oil.