Jordan Peterson on health: what the evidence says · JRE #1769

What the evidence says 01 / RECORD

Peterson suggested there is "some indication" that vitamin C is only required when carbohydrates are eaten, implying it may be unnecessary on a zero-carb carnivore diet. Mainstream nutritional science, as summarized by the NIH Office of Dietary Supplements, holds that vitamin C (ascorbic acid) is an essential nutrient because humans, unlike most animals, cannot synthesize it endogenously; it is required for collagen synthesis, antioxidant activity, and other functions regardless of macronutrient composition, and its RDA (about 75-90 mg/day for adults) is not contingent on carbohydrate consumption. Without adequate intake, deficiency progressing to scurvy can develop within about a month regardless of diet type. There is a narrower, more defensible physiological point in some research: glucose and dehydroascorbate compete for the same cellular GLUT transporters, so very-low-carbohydrate states may modestly reduce cellular vitamin C uptake competition, and some carnivore-diet proponents argue this lowers practical requirements, but this remains a hypothesis about altered demand, not evidence that the nutrient becomes unnecessary. No peer-reviewed clinical evidence supports the claim that carbohydrate intake determines whether vitamin C is required at all. Status: unsupported/misleading; as stated, the claim overstates a narrow and contested mechanistic hypothesis into a categorical exemption from a well-established essential-nutrient requirement.