Whatever floats their boats, I won't stop them from doing what they have to do to get their rocks off.
I do reserve the right to judge them though. That fetish promotes a completely unhealthy lifestyle, and I feel just as much disdain for the feeder (who I see as someone who values getting a chubby over his partner's health, the whole power dynamic between the two of them is also troubling) as for the fed (unhealthy life choices, and the whole bloating thing kind of grosses me out.)
While I don't like it, it is between two consenting adults, they have the right to their own kink, as gross as it may be.