Some smells can not only make you fat, but can also give you a case of the hibigeebies and in extreme cases can cause rapid weight loss.
My son was just hired to empty out a house that was abandoned 4 years ago. Included fridge and freezer full of good but no electricity for a long time. He should drop a few pounds after this weekend. Weight loss began when he had to run outside to puke when he opened the fridge.