Up to 300 grams (dried, 900 calories in total) of various low-fat legumes seem to be relatively well tolerated if the meal is split in two parts at least 30 minutes apart.
Some legumes have a relatively high fat content, e.g. dried chickpeas have 6% fat, which surprised me. Soybeans are also relatively high. Low-fat legumes are lentils, white beans, pinto beans, kidney beans, green peas.
A very high load (300g dried) works if the meal is split in two and if that legume is the only food in the entire meal and if no fat is eaten in the next meal. Haven't figured out how fructose plays into this, but it may also have a role.
Here is my hypothesis:
Bacteria produce stuff that's harmful to me (not to healthy people) from nutrients that occur in legumes (I suspect protein and choline) and harmful stuff is fat-soluble. So the symptoms are very bad when
(a) a food is eaten that was
pre-fermented outside the body (bread, pizza, soy yoghurt),
(b) a meal is eaten that contains protein, choline etc. and
fat for solubility, possibly enhanced by fructose and anthocyanins which raise the activity of some bacteria,
(c) a meal that contains protein, choline etc. is eaten first without fat, but then
fat is eaten in the next meal and the two meals mix and the harmful stuff can then be absorbed (which it couldn't before).
This is not so far fetched. Other cases where a lack of toxicity is (probably) a result of poor absorption of an otherwise toxic compound are known, e.g., for tomatine vs. solanine:
https://en.wikipedia.org/wiki/Tomatine#Metabolism
My findings on cocoa powder lend support to this hypothesis.
As I discussed earlier in this thread,
cocoa powder - I used non-dutched, high-antioxidant organic - in almond milk sweetend with pureed dates tastes super-delicious and is very healthy, but once almost sent me to the ER. Symptoms were absolutely brutal.
Now why is this? Cocoa - surprisingly - is a heavily pre-fermented food. It ferments at tropical temperatures for weeks before being processed:
https://en.wikipedia.org/wiki/Cocoa_bean#Harvest_processing
Now add to that the choline, protein and fat that's in the cocoa (it's a bean!) and from the almond milk, and the fructose in the dates for even more fermentation, it would be absolutely consistent with my theory that an almond milk-based date-cocoa drink would make all hell break loose, and so it does.
The bacteria produced lots and lots of harmful products during the long fermentation of the cocoa
bean at tropical temperatures and those can be very well absorbed because they are all dissolved (and can thus be absorbed) in the fat from the cocoa itself and the almond milk.
Nutella and it's me-too siblings also cause the same problems. This is not surprising because they are basically the same: Fat, sugar (fructose) and cocoa.
Now what can I do about it?
(1) Avoid any and all pre-fermented foods.
(2) Generally eat only low fat meals
(3) Restrict fat intake as much as possible to the essential fatty acids (alpha-linolenic acid and linoleic acid)
(4) So separate the fat from the other meals: Take the necessary fat in an own fat-only meal in the morning with 6 hours to the next meal (yes, fat-only, several table spoons washed down with water. It has to be done.)
(5) I haven't entirely figured out what's the deal with fructose, but for the time being, I will separate it like the fat as well.
This sounds totally strange and weird, but it's incredible to what an enormous improvement this has led. I have now been living in an own apartment unaided by anyone for one whole month. I do all the shopping, cooking, cleaning, errands. Before I tried the dietary adjustments, I was bed-ridden and could only get up for 1-2 hours a day.