To emphasize the importance of nutrition, health lessons often include the adage, "we are what we eat". There is some truth in this. More recently, following the 'green revolution' - the agrochemical practices spreading in the 30's to 60's and now, with the concerns about the healthfulness of genetically modified organisms (GMO's) and how their altered genes transfer to us when we eat animals raised on GMO's.
Now science is showing us that the food we eat nourishes particular microorganisms and that these in turn influence our appetites, health, our mood and even our specific cravings.
Too much sugar can feed the microorganisms that thrive on sugar. These are usually not only microorganisms (like yeast), that release toxic byproducts when they metabolize sugar, they also cause us to crave the foods they like to consume.
The research is now actually confirming that not only that are these organisms affecting how we eat, they affect how we feel, how we behave and what we think. Amazing. So we were over-simplifying when we said "We are what we eat". We are what we eat, yes but we are also what is fed by what we eat. We can feed the microorganisms that help us balance our blood sugar and insulin levels and make us happy, energetic and smart. Or we can eat those that make us sad, inflamed, discontent and tortured with cravings for unhealthy foods.