I ate a low fat raw vegan diet for over two years. Most of my calories came from fruit, but I ate at least a pound or two of greens as well, and a very small amount of added nuts, seeds or avocado. I felt fabulous at first, and loved all that fruit. But then things started not working so well.
I stopped mainly because of these reasons:
1. I checked my cholesterol and my LDL and TG were way elevated compared to what they had been previously on a starch-based diet.
2. I started feeling more and more unbalanced on all that fruit. I would get these horrible crashes in energy that I thought were blood sugar issues (though I never checked during one.) I'd get all sweaty and shaky and dizzy, and I could barely function.
3. Also, eating fruit sugar seemed to make me crave salt, and yet having something high in sodium, like celery juice or actual sea salt, didn't satisfy them, and I felt like I could keep eating and eating. So that made me think that it wasn't an actual physiological need for sodium, but instead was a symptom of being unbalanced because of the fructose.
But I still love fruit