I also don't get nauseous from even a large amount of organic berries (though they do exacerbate my dental plaque and give me dry skin), whereas a small amount of coconut oil does make me nauseous. I found many links indicating that medium chain triglycerides (MCTs) can cause nausea in many people and many commenters attested to this. I reported on this in the other thread. Coconuts also contain short chain triglycerides (SCTs), though I found less linking them to nausea. MCTs (and possibly SCTs) seem the most likely cause of most people's nausea from coconut oil nausea, since strong salycilate sensitivity is reported in only "a small percent of the population" (
http://www.salicylatesensitivity.com/info2).
Granted, all plants contain their own toxins that they use as self defense against predators. Basically, they're natural insecticides, fungicides, etc. For example, "Salicylates in plants act as a natural immune hormone and preservative, protecting the plants against diseases, insects, fungi, and harmful bacteria." So in my view it's not a good idea to eat too much of any single plant food or of any group of plant foods that share the same type of toxin(s)--which is another reason why "30 bananas a day" and "banana island"-type monodiets don't seem wise for extended periods. At least not without at some point eating some edible clay, charcoal or other detoxicant to reduce the toxin load. Mono-eating of plants enables the toxins specific to that plant to build up in the body. This can lead to nausea, diarrhea and other symptoms, which some people want because they consider this a "detox" of poisons. But ironically, in many cases the poisons likely came from what they're eating, and not necessarily from what was already in their body.
On the other hand, the toxins and toxin levels in fruits are generally less dangerous for humans, apparently, than those in "vegetables" (which is not surprising, since plants tend to want some animal to eat its fruits, though humans may not be the original intended animal of its habitat). So when mono-eating fruits you're more likely to get symptoms from excess carbs before you get symptoms from the natural insecticides.