Obesity may be rising, but people have very muscular and agile thumbs. Strangely, this seems to be causing problems in some because the thumb did not evolve with such a load and is being put under stress from all of these new movements, leading to circulation problems and the like.
I rarely text. I just can't be bothered when it's usually easier to call.
On an (even more) off topic side note, I've just installed Firefox 2, and this inline spellchecker is fantastic!
War. It's fan-tastic!