Classicly

Nature certainly never intended that we should weaken, depress, and distress ourselves in the way that is common to present-day living, as is made evident by the prevalence of discomfort and disease relative to our daily food. Nature’s plan of evolution does not work that way in general, does not retrograde in the progress of the improvement of plants and dumb animals, and certainly does not intend that Man, the First Assistant of Nature in the cultivation of things and in the domestication of the powerful natural forces, should suffer and become degenerate contrary to her general law.