ask Jim Fixx if food matters...oh wait, you can't...he died of a heart attack...one of the most prominent runners in recent history pretty much thought that he could eat whatever whenever also...he really liked potato chips...
I think that everybody has to watch what they eat...I used to be able to eat whatever I wanted, but I always chose healthy things to eat...lower fat...not too much bad carbs (white sugar, etc)..
Now I really have to be careful what I eat...I have a more than full time job and don't have time to exercise all day