Thanks to precision nutrition for creating this info graphic on how to fix a broken diet.
The first step is to find out your lifestyle to know what deficiencies and nutrients you need. Second step is to see how much you should eat and what based off of your blood type. This strategy is following the blood type diet. Then the third step is how often you should eat certain foods based on your activity.
Personal Trainers, nutritionist and other health coaches can determine this in greater detail for you to make sure you are on the right track to a healthy lifestyle.