«From the chemical standpoint,» the critical difference between «efficient» native diets and diets characterized by the «displacing
foods of modern commerce,» according to Dr. Price, was that «all the efficient dietaries were found to contain two to six times as high a factor of safety in the matter of bodybuilding material, as the displacing
foods» (emphasis added).11 The
foods that served a «bodybuilding» purpose
varied substantially according to the group and location studied, but in all instances, traditional societies emphasized the most nutrient - dense land and sea animal and
plant foods that could be obtained in their context, ranging from the exceptionally high - vitamin dairy products,
whole rye sourdough bread and occasional meat of the isolated Swiss to the fish, cereals and sweet potatoes of Kenya's Maragoli tribe.
According to The Vegan Society, «B12 is the only vitamin that is not recognised as being reliably supplied from a
varied whole food,
plant - based diet with plenty of fruit and vegetables, together with exposure to sun.»