I am german, scottish, irish, and 1/16th navajo. I blame my general lack of decent facial hair on the latter.
I am, as a general rule, much more resistant than people around me. I recover from illness and injury more quickly than others with the same problem, I'm affected less strongly than others of my weight and gender by alcohol and painkillers (to my chagrin), and some mental effects (like hypnosis) that seem to affect others don't affect me.
I am very, very thin. 5'8", 115 lbs (or thereabouts. I've gained a few lbs in muscle and fat over the last few years at college. The point is, not much more) Most of the men on my mother's side of the family are built the same, if a little taller. All of the men on my father's side are very large in height and girth, and are to a man afflicted in some way because of one or the other attribute. (diabetes, heart disease, bad joints, etc) I count myself lucky for ending up with a body like Steve Rogers instead.