There are several factors that determine the kind of food we should be eating. Our basic food plan should consist of fats (avocados, nuts), proteins (meat, fish, eggs, or vegetable protein) and complex carbohydrates (vegetables). Fruits and melon should also be included in the complex carbohydrate list, but they should be eaten separately from proteins. Grains are also important COH's (carbohydrates), but you have to be careful of the excess gluten that has be "engineered" into the seed that has led to gluten sensitivities in many people.
In general, the ratios in our daily diet should be 20% fats, 40% proteins, and 40% complex carbohydrates. The more active we are, the more calories we will need for fuel/energy and muscle building and repair. In order to get these ratios in the best way we need to eat as much organic food as possible and little or no genetically modified foods. In a healthy person, these ratios of fats, protein, and carbohydrates are generally accepted guidelines. Our gender, our genetics, and our physical and mental activity levels are useful guides to lead us to the dynamo of health that we all should and can become.