No I haven't, but there sure are a lot of JWs that are extremely obese. Not that obesity and gluttony are one and the same, but there is certainly a strong correlation.
And I'm not must saying a little overweight, I mean morbidly obese.
It's noteworthy that the WTBTS has avoided that particular "deadly sin." Here's an interesting "confessional" on the subject by a Christian pastor: