Just to share my two cents. First too much of anything is bad. Over eating I think the biggest culprit of many ailments in our society. Unfortunately in modern times what we as a society over eat (overdose on) really is starch/sugar in all its forms. Not "Bad" in of itself but the quantities are everywhere. Then there are levels of absorption depending on the food and the KIND of processing it under went.
Anyone who had their wisdom teeth removed due to rotting might understand my next point. Why is starch and sugar so "bad" for you? Put another way what is it good for? Well turns out starch and sugar is really good for Candida ( a fungus which lives in your gut) and has a symbiotic relationship with you. It's role in life is to help you break down sugar. Harmless sounding enough. Problem is one can develop and overgrowth (too feeding and multiplying) of this fungus which can begin release too many of its own toxins that erode and eventually create tears into the gut linings exposing the body to those toxins in the bloodstream; kind of like how trapped food against your wisdom tooth creates a breeding ground for bacteria to erode your tooth. This condition is widely classified as leaky gut.
Under this condition having more and more of the even the good stuff (a potato with its nutrients) at this point escapes the greater threat of feeding a fungus population out of control. Unfortunately it seems from my research leaky gut can be caused by several factors but Candida overgrowth is certainly one of them. If one suspects it sound as though you are doomed. Well maybe, but to be more proactive you could try greatly reducing carbs in your diet (if not eliminate it) and get only the carbs from raw sources like vegetables (I would avoid fruit given the condition the sugars outweigh the beneficial fibers gained). Couple this with ingesting unrefined virgin coconut oil, which contains natural anti-bacterial and anti-fungal acids (capric, lauric and capryllic acid). Take 2- 4 tablespoons a day. What will this all do? Well the idea is you kill off much of the overgrowth and give your body to begin healing itself, which is a slow process and patience really is its own reward. Again if you ever had a tooth removed you understand how long it takes for the wound to heal; anywhere from 2 - 6 months which if you think about it is about how long most modern medicines are recommended to consume so why not try this natural approach first and see if it works? But of course demand (no, no consulting) that tests for Candida and/or leaky gut be taken. Doctors are smart but they don't have all the answers from inspection alone and should consider a patients account for what they are experiencing and also understand that people are at least educating themselves about their bodies.
Oh and for what its worth eating too much meat for me gives me what I call "protein headache" so again everything in moderation. Also as a kid I use to eat pizza practically everyday after school. Final note: every body is different from genetics to where flora and fauna in your body are positioned and who much and even their own "health" will affect your health. So there are no cure alls or magic diets but there are only dietary components that you and your doctor must compile to create regimen that works best for you. Gracias.