Hi David,
When I was on EN I had 4 servings per day. However, I now realize that it wasn't enough as I continued to lose weight the whole time that I was on it. So, I was getting about 270mg of choline a day. Not enough according to the chart in the wiki. I also now believe that recent worsening of my brain function and fatigue was due to chronic malnutrition. I was still losing weight until Feb., with a quick five pound loss at the end, before I began to gain weight in March. So, I was losing weight for two years before I started to maintain/gain.
Now that I can eat more food, particularly veggies and fruits, my brain function and fatigue is much better the past two months. (I also don't need to gain any more weight!)
Thanks for continuing to do all of your sleuthing for us David. Whenever I learn more from your research, I make sure that I am eating the foods that contain all of the nutrients that I may be low in. I believe that it has greatly improved my brain function and fatigue the last two months, despite blood levels not showing much deficiency or improvement.