What changes in your diet have changed your life?

I’m reading Eat To Live at my husband’s request, and the overal gist of it is eat primarily fruits and vegetables. I actually agree with that, but have not in the past made a significant change in my diet to do it in any permanent way. In the book there are stories about people who changed to this diet and their health changed dramatically. Some people lost a lot of weight, although the major focus in the book is the nutritional and protective qualities of the nutrients found in fruits and vegetables. He talks about cancer and heart disease and shows stats from around the world about how animal protein is killing us, but more importantly high consumption of vegetables, especially leafy green ones, help protect you from cancers.

So, I am wondering what magical stories jellies might have about diseases clearing up, not needing previously necessary medications anymore, and relief from symptoms of chronic conditions when you changed your diet.

I am not so much looking for stories of allergies like lactose or gluten. Because, obviously if you have an allergy you will feel better when you stop consuming the product. Unless, you had a side benefit you did not expect.