Are Vegetarians Healthier?

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True vitamin A, or retinol and its associated esters, is only found in animal fats and organs like liver. Plants do contain beta-carotene, a substance that the body can convert into vitamin A if certain conditions are present (see below). Beta-carotene, however, is not vitamin A. It is typical for vegans and vegetarians (as well as most popular nutrition writers) to say that plant foods like carrots and spinach contain vitamin A and that beta-carotene is just as good as vitamin A. These things are not true even though beta-carotene is an important nutritional factor for humans.

The conversion from carotene to vitamin A in the intestines can only take place in the presence of bile salts. This means that fat must be eaten with the carotenes to stimulate bile secretion. Additionally, infants and people with hypothyroidism, gall bladder problems or diabetes (altogether, a significant portion of the population) either cannot make the conversion, or do so very poorly. Lastly, the body's conversion from carotene to vitamin A is not very efficient: it takes roughly 6 units of carotene to make one unit of vitamin A. What this means is that a sweet potato (containing about 25,000 units of beta-carotene) will only convert into about 4,000 units of vitamin A (assuming you ate it with fat, are not diabetic, are not an infant, and do not have a thyroid or gall bladder problem).

Relying on plant sources for vitamin A, then, is not a very wise idea. This provides yet another reason to include animal foods and fats in our diets. Butter and full-fat dairy foods, especially from pastured cows, are good vitamin A sources, as is cod liver oil. Vitamin A is all-important in our diets, for it enables the body to use proteins and minerals, insures proper vision, enhances the immune system, enables reproduction, and fights infections. As with vitamin D, Dr. Price found that the diets of healthy primitive peoples supplied substantial amounts of vitamin A, again emphasizing the great need humans have for this nutrient in maintaining optimal health now and for future generations.