Dr. Greenland echoed that evaluation, stating that “the advertising and marketing of coconut oil is complicated. It’s attempting to promote it as a wholesome fats, however those that know its composition don’t assume that in any respect.”
These and different specialists half firm with advertisers and advocates for coconut oil primarily based on its chemical make-up and the well-established organic exercise of various sorts of fatty acids.
“Fat can’t flow into by itself,” Dr. Greenland mentioned, explaining that long-chain fatty acids like these outstanding in beef tallow are absorbed into the bloodstream by fat-carrying particles known as chylomicrons that ship the fats to tissues all through the physique. Chylomicrons preserve LDL ldl cholesterol in circulation, giving it ample alternative to get caught in arteries. Fats which are primarily medium-chain fatty acids, however, are extra water-soluble; they are often absorbed into the bloodstream with out the help of chylomicrons and transported on to the liver, the place they’re used for vitality.
Although lauric acid is normally known as a medium-chain fatty acid, Dr. Sacks mentioned, this label is basically arbitrary. “Classifying lauric acid as a medium-chain fatty acid is a misnomer,” he wrote. “Rather than the variety of carbon atoms in a fats,” he mentioned, “what counts is how the fats is metabolized within the physique. Lauric acid behaves like a long-chain fatty acid,” the type that promotes atherosclerosis. In addition, coconut oil has two different long-chain fatty acids — myristic and palmitic — and all three have an artery-damaging impact on levels of cholesterol within the blood.
One declare made for coconut oil is undisputed: It can increase blood ranges of HDL ldl cholesterol, which has lengthy been thought to guard in opposition to coronary heart illness. However, a clear-cut well being advantage of HDL ldl cholesterol has but to be demonstrated in individuals. As Dr. Sacks reported, “Genetic research and HDL-raising medicine haven’t to this point supported a causal relationship between HDL ldl cholesterol and heart problems. HDL consists of an enormous array of subparticles that will have hostile or helpful actions. It is unknown which, if any, meals or vitamins that increase HDL ldl cholesterol accomplish that in a approach that reduces atherosclerosis and coronary occasions.”
Ditto, mentioned Dr. Greenland. “Efforts to boost HDL haven’t led to helpful scientific enhancements.”
Proponents are additionally keen on citing the truth that quite a few Indigenous populations — together with Polynesians, Melanesians, Sri Lankans and Indians — devour moderately giant quantities of coconut merchandise with out struggling excessive charges of heart problems. However, most of those individuals have historically eaten coconut flesh or squeezed coconut cream as a part of a eating regimen that’s low in processed meals and wealthy in fruit and veggies, with fish as the primary supply of protein. They are additionally way more lively bodily than typical Westerners.
But even that’s now altering, a New Zealand analysis staff reported, with the “imports of unhealthy meals akin to corned beef, quick meals and processed substances, main to very large will increase in weight problems and poor well being.”