Everyone is unique and until we know more about genetics there will not be rules that will "nail it down for everyone" anytime soon until. A good example is coffee. You can find articles that say coffee is good and just as many articles saying coffee is bad. The answer is:

- If you have gene that will metabolize caffeine fast then you reap health benefits of antioxidants in the coffee and it's good for you

- If you don't have gene that metabolizes caffeine fast then caffeine will linger in your system and cause all sorts of problems and therefore coffee is bad for you

At this age there is no other option except for testing and seeing what works on you and maybe see what your parents did.