an exert from Dr. graham's website (foodnsport.com):

"If too much Sugar is not good for you, why the emphasis on eating so much sweet fruit?
Before the body's cells can utilize food for fuel, the food must first be converted into sugar, whether the originating food is carbohydrate, protein, or fat. Carbohydrates are the easiest to convert to useful sugars. Fruits are mostly simple carbohydrates. It is much easier on the digestive system to process fruits for fuel because they are composed primarily of sugars, requiring much less digestive energy, and they come in a complete nutritional package of vitamins, minerals, proteins, and fats. When there are insufficient carbohydrates present to convert to sugar, the body will transform fat and protein into sugar, but at a higher cost: more time and energy spent on digestion with the creation of toxic residues.

I have candida or a yeast infection. How can I eat so much fruit?
Excess fat is the culprit in candida, not sugar, per se. When fat levels in the blood rise, so does blood sugar, because excess fat inhibits insulin from performing its function of escorting Sugar out of the bloodstream. The excess fat lines the blood vessel walls, the cells, insulin receptor sites, the Sugar molecules themselves, and the insulin with a thin coating of fat, thus blocking and inhibiting normal metabolic activity.
Too much sugar in the blood is as life threatening as too little and can result in serious illness or death. Yeast, or candida, is a constant presence in the blood; it serves as a life preservation mechanism, blooming when there is an excess of sugar in the blood stream to bring blood sugar down to a non-threatening level. When the sugar is distributed and used by the cells of the body, the yeast quickly dies off as it is supposed to.
If fat levels stay chronically high due to a poor diet, sugar will remain in the bloodstream and feed the large candida colonies instead of feeding the 18 trillion cells of your body. Starved for fuel, these cells can no longer metabolize energy, and you become tired, and feel rundown. Because all carbohydrate, fat, and protein that we eat is converted to simple sugar (glucose) if it is to be used by the cells for fuel, the way out of this cycle is not to eat less sugar, but to consume less fat. When fat levels drop, the sugar starts to get processed and distributed again, and the yeast levels drop because there is no longer excess sugar available.

Do you know anyone who has beat Candida with the 80/10/10 lifestyle?
Yes. There are many. For an example see Jackie Dees' testimonial entitled, “Beat Candida Overgrowth.”

Many people have Bio Unavailable copper / excess copper, and low zinc, and eating a vegan diet will make it worse. Animal proteins contain a much better ratio of Zn to Cu, and plant foods are too high in Cu.