I really want to make one thing clear, but it's late and I'm supposed to be in bed, so it will be short but expounded upon at a later date...
Sin is sin. I did not compare being overweight with murder and adultery. I did, however, level the sin of gluttony with murder and adultery. Actually, I didn't, God did. There is no 'better or lesser' sin. If a person is overweight, they are not a sinner. 'Skinny' people are sinners, too. If a person is overweight because they have an addiction to food, it has become their 'god', that is a different story. It is a result of gluttony. If a person is overweight because they have a thyroid problem or some medical condition caused by something other than food abuse, they aren't sinners! If a person is bone rail thin because they despise food, a gift from God, viewing it as evil and neglecting their temple that way, that is self-abuse, also a sin.
At some point I'll share my journey through all this and the dream God gave me and the audible conversation He had with me, well actually, He just spoke and I listened, when He called me out on my gluttony.
In the meantime, I don't think that if a person is 'overweight' that they are sinners because of their 'appearance'. Sinners, ie all of mankind, come in all shapes and sizes...some sins can be 'hidden' for a time, others cannot, but the one thing that is true, regardless of our weaknesses, our tendencies and our 'secret hidden sins', God will bring them to light, because in Him there is no darkness. Praise God for that!