Bacteria and yeast overgrowths are common in weakened immune systems and that has a lot to do with malnutrition contributing to the weakened immune system, but when it does overgrow, does everyone really think the "toxins" said to be a by-product of candida is really causing all the exact same huge number of symptoms that malnutrition does? That would be incredible odds to say the least.
I think the scenario is pretty easy, patients started going to the alt medicine practitioners with all these complaints and these practitioners where trying to find the cause and either through ignorance or being a snakeoil salesman, they overlooked the malnutrition angle and noticed a large percentage of them also had the simple candida infections and assumed that must be the cause and found it was a lucrative diagnosis to treat. ching-ching
I believe the "chronic lyme" disease to be the same misdiagnosis and that's why those two diagnosis have been so hard to treat and why conventional medicine never bought into either of them.
I'm not a full-on fruitarian. I still eat cooked foods in the evenings and ironically, I think that's been the problem why my digestion still sucks. I started eating more fruit right as winter started and the lack of quality fruit and the coldness of winter has prevented me from trying the strict raw vegan 811 diet as Dr. Graham and 30bad promote. I didn't recognize I had a digestion problem to the degree that I do until a couple of weeks ago when it hit me that must be the reason why I can't eat more calories than I currently can and why Dr. Graham recommend either doing a mono-fruit island or a water fast, it's to heal your digestion. As he says, it's not the foods that will heal, but the absence of the bad foods that are doing the harm.