Both is a possibility given @worriedguy ‘s hypothesis below:
The fat person and the thin person have the same basic digestion pattern and enzymes.
The fat person and the thin person have the same basic diet.
The quantity of food consumed by a fat person is twice that of a thin person.
Using the assumptions stated above, the chemical reactions are the same. However since the intake is doubled on a fat person I would expect the flatus output to be doubled as well.
Ah, @963chris , now we’re talking WHAT we eat
Does garlic, steak, pepperoni, refritos, beer, vodka smell worse than rice pilaf, celery soup, and water?