The human body is undoubtedly the most advanced piece of technology known to man. But if we would like our bodies to work at optimum efficiency, then we must be careful not to overwhelm the system with too many tasks at once. This is why both fasting and meditation yield such great health benefits, because we are freeing up resources that can be used to address other needs of the body, or to increase the productivity of the tasks we are perpetually engaged in.
When it comes to nutrition, it is most beneficial to refrain from stretching the limits of our body's resources. If we eat a banana, our body will do its utmost to safely dispose of any toxins contained within it, while also attempting to extract as much goodness as possible from the fruit, and to put all that can be to the best use possible. With the human body being such an adaptable instrument that seeks to learn from each experience, by continuing to eat bananas, our body will then get very efficient at conducting this process and will eventually be able to do so while using less resources.
However, if we choose to eat a banana, an orange, an apple and a mixed salad, and perhaps finish it off with nice chocolatey treat, we are now asking our body to manage to extract all the goodness from each of these foods, and to eliminate all the toxins from each one, at the same time. This is a lot to ask of our body, and while it may manage to do so to some degree of efficacy, that level would be greatly increased had we allowed the body the opportunity to approach each task one at a time.
The resources of the human body are already stretched thin by our environment. In any given moment, your body is attempting to fight off the negative effects of dangerous WiFi and satellite signals, toxins in the air and many more hazardous environmental factors. So it is up to us, should we want our bodies to reach the highest levels of utility, to be conscious of the workload we are demanding from them.
This is not to say that one should eat only one food for the rest of their life. But that we should not romanticise the process of nutrition and seek to eat complex meals with hundreds of ingredients at every opportunity. We should opt to keep a simple diet with minimal foods, getting to know intimately that which we are eating and the effects it has on our body and our mind for a time, before switching up to another food and doing the same. Over time, we will gain not only the ability to digest our selected foods most efficiently, but a deeper understanding of our relationship to each food and the positive, and negative, effects that each one has upon our body.