The only situation I can think of where a high BMI would be an advantage would be something like a holocaust situation where people are starving to death over time. In that case, I'd think that the more bodyfat a person started with, the longer he could hold on to his life.
Just don't go adding 50-60 years to your life with Krispy Kreme supplementation.I must have added some time to my life last year while gaining 10 lbs. Cool...

Well, maybe they just had a bit more 'thermal insulation' for the chilly swim!I imagine the high-BMI folks from the Titanic sinking who weren't on lifeboats lasted maybe 60-120 seconds longer in the North Atlantic than the lower BMIs.