Well, since we're all sharing...myself, I wouldn't call rice and corn exactly "healthy". All grains are commonly contaminated with mycotoxins (fungal poisons) and all corn is universally contaminated with fungus, according to JAMA 2002. The fungus...cancer-causing aflatoxin, the world's most potent carcinogen. Reported daily intake of aflatoxin is 0.15 mg-0.5 mg per day in American diet. Aflatoxin is lethal in single doses of only 10-20 mg. Vomitoxin is a frequent contaminant of wheat and corn, and can cause nausea, headaches and abdominal cramps. Mycotoxins can also contaminate foods such as peanuts, potatoes, mushrooms, and alcohol. What's a girl to eat (and drink) these days :/
I think anyone changing their diet has to give it more than a few weeks to know whether or not if it will be beneficial to them. Some may need to stay on the course for many months, depending of course, on the "diet". Your body didn't get sick overnight. I agree that some are pointless, but if they have actually helped others, I am inclined to think I would give it a fair try. There was no one more amazed than me when I found that just by changing my diet would help me get well again. Everyone is different. What works for one, may not work for all, but when a lot of people claim to have gotten better by eliminating the same foods (often processed sugars/ grains and/or dairy), there must be something to it. I think many have food intolerances and don't recognize it.