FuturePundit reports that older people lose their mental acuity faster if they are overweight.
The press release also describes how people with a history of cyclical weight loss and gain have more problems in their old age. Try to lose weight in a way that you can keep it off. Of course, that's much easier to say than do.By "older" people, I would say anyone over 50 needs to pay attention.
I find it ridiculously easy to gain weight. Back in 2005 I posted about my problems with cycling down and up until I had the blinding insight that Americans stay fat because we are always dieting. And so I went on the Methuselah Diet with great success. That's my story and I'm sticking to it.