Meat, of course! It’s been a while, but as I understand it a lipoprotein carries fat molecules. Fat is not water soluble so it needs to be encapsulated and transported inside a molecule that is water soluble. It is interesting that a molecule that large can cross the blood brain barrier but I’m no expert.
I am in no position to dispute the theory but wonder how much of this is tainted by politics like so much science these days. Meaning, move to scare societies away from animal proteins.
Lucky for me, I can't eat much of any meat fat. Alpha-gal allergy - https://en.wikipedia.org/wiki/Alpha-gal_allergy
Alpha-gal allergy — or mammalian meat allergy (MMA)[1] — is a type of meat allergy characterized by a delayed onset of symptoms (3-8 hours) after ingesting mammalian meat and resulting from past exposure to tick bites. It was first reported in 2002. Symptoms of the allergy include rash, hives, nausea or vomiting, difficulty breathing, drop in blood pressure, dizziness or faintness and severe stomach pain.[2]
Got a bunch of tick bites while cleaning up the mo-in-law's property years ago. Took me a while to figure out why I was waking up at 2am with the hives. Finally associated it with ribeye night. The allergy subsides after a while but I live in the forest so another Lone Star tick bite and it comes back. Worst reaction I had was from a ham made from homegrown pig/hog. Basically anaphylactic shock. Dropped out of consciousness twice. Now if I eat beef or some cuts of pork, I take a Benadryl before bed. I also have an epipen. Never was real big on fat and have always trimmed it off but that marbling is fat too. We've got meat goats and will be taking any bucklings born from now on for the freezer. Very lean meat.