Potato chips (for each one increased daily serving, +1.69 pounds more
weight gain every four years).
...
Also, those who slept six to eight hours a night gained less weight
than those who slept less than six or more than eight hours.
http://www.cbc.ca/news/health/story/2011/06/23/diet-weight-gain-potato-chips.html
www.peoplewho.org