Lets face facts here.
NO paying passenger likes to look at overweight cabin crew.
Clearly that is why the asian airlines don't have any, and the cabin service on these asian carriers is generally second to none.
However, being slightly overweight is not generally a safety issue.
Of one particular concern however was a female CC on one recent flight who was very pregnant.
She had great trouble getting down the narrow isle, could not push (by herself) the booze/food cart and, absolutely could not reach up and close an overhead locker.
Absolutely useless in any type of an emergency situation, yet here she was on duty.
Oh yes, the airline....Delta.