Well, start with who you are as a physical manifestation. Every body is different. Yet, we are programmed within the same food structure. And basically, that may be healthy for a certain average. But not as a general rule.

Some people need a daily routine and eat what is in season at the environment that is befitting their type, others eat little bites during the day of all kinds of foods. It depends on the type you are.

Check out: Human Design type and digestion.

For the type I am, I have a passive digestion, and changes in food patterns, in terms of types of food, size of servings- usually small portions alternating, times of enjoying these and the places where I am enjoying these, are a daily occurrence, and that fits me right.

Would I be pressed into a rigid sequence of say: 6 o'clock breakfast, 12 o'clock lunch and 18:00 dinner, it would kill me in the end, and would cause a lot of problems in the meantime.

It is not about adopting one system over another. It is about listening to your body, to who you are, and live according to it.