I was going and over some things with DD3 and Choline came up.

Read this:

Diabetes and Choline

Physiologists first identified the role of insulin deficiency in type 1 diabetes by studying the disease in dogs. In 1889 they produced diabetes by simply taking out the whole pancreas from these dogs and, after scrambling for a couple decades to identify the active component, they cured the diabetes with insulin in the early 1920s (6). As cured as their diabetes was, the insulin-treated dogs nevertheless developed severe fatty liver degeneration and ultimately died of liver failure. Adding raw pancreas to their diet, which was composed of lean meat and sucrose, cured the problem. As researchers attempted to discover what it was in raw pancreas that cured the disease, they found in the early 1930s that egg yolk lecithin, which is abundant in choline, could cure it (7). And then they found that choline alone could cure it (8).

It later turned out that the dogs became deficient in choline and methionine without a pancreas because they weren’t producing the digestive enzymes needed to free up those nutrients from the foods they were eating. Thus, simply providing them with the digestive enzyme trypsin could cure the fatty liver (9).

We now know that choline is necessary to produce a phospholipid called phosphatidylcholine (PC). This is a critical component of the very low density lipoprotein (VLDL) particle, which we need to make in order to export fats from our livers. The amino acid methionine can act as a precursor to choline and can also be used to convert a different phospholipid called phosphatidylethanolamine directly into PC. Thus, the combined deficiency of choline and methionine will severely impair our abilities to package up the fats in our livers and to send them out into the bloodstream (10).

https://chrismasterjohnphd.com/2010...-and-egg-yolks/

The comments have a lot of interesting info also.