longtimelurker: I'll be the first to reply here...
The major thing that I think characterises my diet is the sheer amount of meat. I feel as though I've missed something if I don't have at least one meat meal a day.
Other than that I, like a lot of British people, have a great passion for oriental foods - esp. Indian, which I usually have at 2x a week at least.
As for suppliments, nah - don't believe in them. It can be just as risky to overdose on vitamins than to underdose (esp. the fat-soluble ones like vit A). I kind of rely on what I eat to provide all I need.
As for nutrition and size - it is well known that the quality of nutrition can effect size enormously (just look at the recent generations of Japanese compared to their predecessors) - so I see no reason why having a poor diet shouldn't effect your size in other areas as well.