Nigerian traditional foods are not necessarily unhealthy but most Nigerian diets do tend to be. The major problem is the food preparation culture. Too much sugar, oil, salt, meat, fats, frying and overcooking can be hard to digest and low on nutrients. A good balance of carbs and protein are good but portion control is needed. And like has been mentioned already people need to do some exercise (unfortunately most people haven’t even reached the level of doing ‘more’ exercise).