Well...a vegan diet might work for some but I only got sicker on a mostly raw vegan diet for 2 years. My hair was falling out and I had absolutley zero energy. I was also at my worst battling the roundworms and flukes. We even spent 3 months eating mostly fruit in Costa Rica to try and get rid of the parasites. So I know for a fact that that did not work for us.
I think a huge part of the solution for us has been HCL or digestive enzymes with every meal. I have regained my health by eating a Paleo diet with loads of vegetables and bringing up mineral levels in the body.
Each of us has to find the optimal diet that works for us. Some need more carbs and some need more fat and protein.