The foods of each season reflect the challenges the environment poses on the body. Fruit grows in summer to provide a counterbalance to the heat and dryness of summer. The body also has more "yang" energy at this season, so it can deal with the sweetness of fruit without getting fat. Heavier foods of the fall and winter provide a yang balance to the cold, dry yin nature of those seasons. This can get more detailed, but that is a good general summary. Holistic medicine categorizes foods in general categories that can be used by layman to make dietary changes that will positively impact their conditions. Jew medicine will try to make you zoom in at 1000x magnification at each molecule, ruining your chances of making any practical conclusions. One needs to look big picture before they zoom in.