An interesting question. To be fair, anything said is purly anictodial unless someone has weighed a sizable sample of congregations and compared the mean result to similar cross sections of the surrounding areas....
but yes i think being overweight is a dubbie problem. The question though is do they "encourage it"..... ?
the short answer is No. The long answer yes.
There is nothing in print that says its ok to be fat. In fact there are referances that encourage one to respect tge life god has given blah blah blah....
But the long answer yes part, imho, is what has already been said here, that the lifestyle the org promotes most definatly encourages obesiety and i certainly see plenty of it. The constant hustle, the stress, the lack of time too actually take care of onesself in the face of the kingdoms interests..... And yes definatly the concept that the new world will fix it all so screw it and eat yourself happy.