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Generally low FODMAP vegetables are the safest foods with regards to antinutrients with the exception of nightshades. There's just no reason to eat these as they have toxic compounds. Potatoes contain saponin, a type of "soap" that is designed to dissolve the gut cell membranes of the predator that eats them. All of us have varying sensitivities to antinutrients. I'm guessing people with IBS are highly susceptible to these.

Anyone here who is still eating nightshades - white potatoes, tomatoes, eggplant and peppers should read this article. It explains the science very well.

http://thepaleodiet.com/are-potatoes-paleo/#.VvMaQ_l97IU

The highest level of saponins are in the potato skin, but even skinless mashed potato contains chemicals that immediately enter the blood stream.

All foods that contain high levels of antinutrients: wheat, all grains, the flour from grains, legumes, nuts and nightshades can cause Leaky Gut (intestinal permeability). Lectins and saponins can attach to the gut wall and destroy it, creating holes that allow protein particles and also bacterial products, polyliposaccharides, to enter the blood stream. This sets up an immune reaction. For some people, IBS can then become a more serious auto-immune type disease such as inflammatory bowel disease.

Antinutrients such as lectins and saponins also block the action of digestive enzymes, further adding to gastrointestinal distress.

Sweet potatoes are OK; they're not nightshades. I've found success with a Paleo autoimmune diet that specifically bans antinutrients.

You need to include vegetables, lots of them, in your healing diet. You might need to boil them up for a long time at first, but you have to eat these. I stick to low FODMAP vegetables with plenty of meat, seafood and a reasonable level of saturated fat.
 
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