We all know what we enjoy eating and most of us have been eating a similar diet for most of our lives unless you have tried various slimming diets or keep fit diets or other publicized diets which have promised improved health greater fitness or whatever. The choice of food we eat is one of the most profound activities we humans engage in. For 100,000 years man has eaten a diet which really derives straight from nature be it berries, leaves, roots from the land, the occasional insect or grub, the animals came his way and the fish fro the sea and rivers. Anything which in fact gave him some sustenance. One theory why humans have large brains compared with other mammals is that we were hunter-gatherers and had to have an encyclopedic knowledge of fauna and flora, when it was ready to eat, what was edible what was poisonous and where to find these sources of nutrition when they were in season, all this knowledge was essential for simple survival. The effect of this was that the environment that man lived in coped very easily with his appetite and little damage was done to it. Modern man, however, is a different matter, we have learned to farm industrially, we have learned to provide ourselves with a very rich, high calorific diet, seven days a week, 365 days a year by simply visiting our local supermarket and picking the food off the shelves.