Sociobiology

The example used with the people who prefer sweet food and the conclusion that we are biologically programed to over indulge in these food because of an ancestral lack of sweet foods is quite odd. But what is even more odd is that I have heard something very similar to it before. I thought of the advice, eat what you crave.

I have been told that when you crave something it is your body's natural way of telling you that you need a certain nutrient that can be found in that particular food. But what scientific proof is there of this actual crave busting nutrient. Or can we now say that it is because I am sociobiologically programmed to want these foods. Or even in a broader sense I am the way because it is how genetics and the current environment has programmed me.

I understand the bases of traits and maybe even personality being passed genetically but is this all an excuse to find out why we are who we are, instead of using free will? Do not get me wrong I do believe in the theory that behaviors can be passed but I am a strong believer in the meme theory, that ideas, concepts, behavior are passed down but by the process of imitation not through genetics.