I think that perhaps he has got it around the wrong way.
The clutter doesn't cause overweightness in these hoarders - rather their being overweight has made their hoarding worse.
Being a pack rat from way back because my tidy wife keeps me in check, the only rooms that are untidy or out of control are the rooms my wife has surrendered to me.
In the old days these rooms were a lot worse than they are now because I was so tired from carrying around those extra 87 kilos - I had no energy to tidy or organise them. Nowadays, they are a lot tidier and organised because I've got more energy.
Even in general life my habits are more conscientious. In the old days I rarely lifted a finger around the house preferring the arduous task of stopping the sofa from running away by laying on it and manning the TV remote control (it's a dirty job but someone has got to do it

).
Now I will clean something up without being asked.
I was slack in the old days not because I was lazy...I was slack
and lazy because the effort was greater than a mere mortal could bear.
I will give him the link between rampant consumerism and gluttony.
I once did a sermon on Gluttony (as part of a series on the 7 Deadly Sins).
I surprised a lot of people who would have expected a sermon on weight loss.
Instead I took my cue from Dorothy L. Sayers' essay "The Other Six Deadly Sins" where she talks about society's gluttonous ways; over-consumerism. Our bins are more than twice the size they were when I was a boy and yet they are all filled to over flow.
Every few months the council has a verge collection which almost every household places a mountain of junk by the road.
Worse still, the Bureau of Statics show that the more a household earns - the more they waste.
We Australians literally throw out billions of dollars worth of unused stuff per year.
In food alone we throw out or allow to go rotten nearly $6,000 MILLION dollars per year.
The root causes of both this waste and our overweight bodies is a lack of good stewardship.
No one is prepared to take responsibility for their part and step up and do the right thing.
Kim