I'll make this short: It isn't the sugar, it's what feeds on the sugar (or any refined carb diet low in "bulk")
We're perfect Fungus/mold/yeast factories: Inside our bodies it's dark, moist, warm, and given the proper food, perfect breeding grounds. These give off powerful toxins. (think of eating the wrong kind of mushroom & you'll get the idea.)Ethynol - which is a poison - is one of the toxins given off. These toxins can not only screw up your body with a plethora of symptoms, but can mess with your head.
Unfortunatly, I'm an expert through experience on this. It is curable, and actually the cure is relatively simple: diet change and stuff that is readily available without a perscription. It is, however, a long road to hoe, and it's a b*tch going though it. (The yeast, when killed, realeases all it's toxin, so you get worse before you get better. It's called "die off") But forget doctors, the AMA, etc.
The common, all purpose, name for this malady is candidiasis.
Bump for later read.