There's a big difference between eating an all-raw, high-fruit diet and eating lots of fruit as part of a non-raw, high-fat diet.
I've seen negative items about including fruit as part of the latter but so far not the former. I've read that fat in the bloodstream interferes with sugar metabolism and can cause all sorts of problems, but I haven't seen anything indicating that an all-raw, high-fruit diet would cause blood sugar problems. Fruit actually provides an even, steady burn.
I've been testing my blood sugar from time to time, and there hasn't been a single spike. It's actually been incredibly stable, including after a meal.
Do you have any evidence that an all-raw, high-fruit, low-fat diet causes blood sugar problems? If so, please pass it along. I've found nothing on this so far aside from conjecture.