Actually, if you take into account the decay part of my idea, it fairly well mimics the effects of poor diet.
Since stats require FEPs not to decay, you have to eat a well balanced diet or your stats might reduce, even reduce to below 10 (the current minimum).
Also, when aging effects are added, you can have that increase the rate that stats eat FEPs for maintenance, while perhaps also reducing the amount of food possible to eat (I think I've heard that average size of a diet decreases as the person eating it gets older).
Also, diseases (when implemented) might increase the maintenance cost of certain stats, or turn FEPs into black FEPs (starve a fever, feed a cold).
This is all conjecture of course. I have no hard numbers. I would just like to see a system that somehow causes a stat cap, so as to remove one of the problems with characters that can't age, that being no one can ever catch up to them stat wise.
The title of strongest should not be permanent., as that is the road to tyranny.