Why do you think that some people who were REALLY overweight, and lose weight, become mean / douche bags / bit

Prof_Don
Like that dude Schmidt from New Girl; a guy that was very overweight / obese, lose weight,

and became a mean person when he wasn't before.

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I know that's a fictional character, but that's the first example I can think of.

1) Do you know or hear about anyone like that (who was really overweight, lost a lot of weight, and became a more "mean" person")?

2) Why do you think this happens to these people after they lose a lot of weight?

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Answer in as much detail as you wish.
Updates
+1 y
The last word in my question title is supposed to be"


"become mean / douche bags / bitchy?"
Why do you think that some people who were REALLY overweight, and lose weight, become mean / douche bags / bit
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