I don't think that's 100% true. It might help a bit, but I don't think it's the cure to these diseases. I don't believe that much in chemicals, I think the answer must be in the natural world.
Let's say for example, Avandia has been taken off the market, avandia used to be one of the most important diabetes drugs then they discovered it caused too many side effects. Here's one of the reasons why natural is better - http://www.sucanondiabetes.com/what-is-a-nutraceutical/