Vitamin A is predominantly found in animal foods in its most bioavailable form, and subclinical vitamin A deficiency is likely widespread due to low consumption of organ meats and inefficient conversion of beta-carotene.

“and the vitamin a is the same thing it's like that's in that's in animal foods predominantly and at least in the bio most bioavailable form and that's i i suspect that a lot of there's a lot of subclinical vitamin a deficiency in the world tremendously because you'd have to eat so much sweet potato to get enough beta-carotene to be converted and nobody eats liver anymore”

“if you wanted to get your vitamin a quote from plants if you were part of the 60 to 70 percent of the population that could actually convert beta-carotene to bioavailable vitamin a and you ate the food the plant food that was the richest in beta-carotene which is sweet potatoes you would sometimes have to eat close to a pound of sweet potatoes per day to get the equivalent of the rda for bioavailable quote preformed vitamin a”