Human beings have evolved to make the most of the resources available to them in ways that are subtle and complicated. When we change our diets, especially when we do so quickly, we are effectively conducting huge experiments in nutrition. We ought to have more humility. Nutritional science is still young and there is so much we do not know. If we have eaten certain foods in certain ways for millennia, we should assume until it is proven otherwise that there is probably a good reason why. Traditional foods that don't fit neatly on the contemporary dietary food plate should generally be chosen over highly processed ones that do. We should assume that traditionally made fatty blood sausages are preferable to lean, factory-made salamis; that spoonfuls of honey are superior to sprinkles of sweeteners. Witnessing how poorly traditional societies are faring as they undergo a nutrition transition should make those who have already completed it question whether their diets have moved too far.