Parent is probably referring to nutrient deficiency in the general population, which is almost exclusively not vegan. As I recall, the deficiencies are calcium, iodine, vitamin C, vitamin E, fiber, folate, magnesium, and potassium. If you ate everything a vegan did, I&#x27;m willing to wager you would be full, and wouldn&#x27;t be hungry for meat. I think the point is, the plant-based diet is less calorie dense, but more nutrient dense, so one is more likely to develop deficiencies from eating mostly animal products.