It is sad on so many levels.
Those who know the truth know that the only true beauty comes from the degree in which we reflect God. It has nothing to do with the color of our skin, hair, race ,etc...
I guess that, depending on the degree and reason(s), being grossly overweight could be a sign of the sin of gluttony and thereby make one "ugly" due to this reflection of sin, but overall, beauty, true beauty has nothing to do with all this vanity.
There are some very ugly people who have beautiful, healthy and fit bodies - hollywood and the music industry are filled with such demonic people.
Those who attempt to justify being obese are also ugly in trying to justify their gluttony.
Beauty consists only in and of God.