Some have been proved, but most are just plain assumptions.
1) Bullying

Depends here. You might be bullied whether you are very fat or very skinny. If the first then either you might worsen your condition by eating even more or starve yourself in order to make your peers stop bullying. If the second, then either you might go even skinnier or eat excessive amounts of food in order to make them stop.
2) Collectible Gifts

Many snacks have gifts like Tazos and such. So if you want to collect them all, you have to buy the snacks…so you eat them instead of throwing them away, because it would be a waste of money then.
3) Depression

If someone suffers from depression, then either they will put on huge amount of weight by staying home and eating, or they will feel so down that they won’t have the need to eat. Not much different than bullying.
4) Lack of exercise

Actually, you might put on more weight if you eat less but not move/exercise than vice versa. Of course I don’t mean eating a ton, but let’s say for example if you eat five cheeseburger and not exercising, then you might put on more weight than eating seven cheeseburgers and exercising. Cheeseburgers are used as an example.
5) Peer Pressure

I have read somewhere, that if you have overweight friends, then you might end up that way too. True. You might hear comments such as, Dude you eat too little, You are only skin and bones, etc.
6) Pretending to eat like your dad

This is for boys mostly, trying to eat as much as their dads.
7) Quitting smoking

This applies for smokers obviously. If you happen to know any ex-smokers, then you might notice that after they quit smoking they might put on weight.
8. Stress

I cannot see how those two are correlated, but stressful people tend to put on weight easier. Maybe they eat quickly or...maybe it's subliminal like the image above suggests?
9) Stupid challenges

I mean challenges of the kind “Can you eat thirty hot-dogs in ten minutes?” and such. Well, not only you will put on weight, but you will mess up your stomach too by eating so fast.
10) Treats

When you visit someone, then they might offer you some candy or some cake or whatever. Some people feel insulted if you refuse though, and in order to please them, then you might have to eat it and if in case you liked it, then some people might ask for more.
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