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Diet also has a greater impact than other factors such as physical activity or sleep duration.
One of the researcher said:
"These findings underscore the importance of making wise food choices in preventing weight gain and obesity.
People who slept six to eight hours a night gained less weight than those who slept less than six or more than eight hours.
The team analyzed results from three large-scale studies of US health workers: the Nurses' health Study, the Nurses' health Study II, and the Health Professionals Follow-up Study. Together the studies monitored the health of more than 100,000 individuals for up to 20 years.
All were initially free of chronic diseases and not obese. Every four years, participants gained an average of 3.35lbs, putting on almost 17lbs over the full 20 year period.
Increased daily servings of certain foods were associated with the largest amount of weight gain per four year period. They included potato chips, which added 1.69lbs of extra weight, and sugar-sweetened drinks, which added one pound.
Some foods were actually associated with a lowering of weight gain when their consumption was stepped up. They included nuts (minus 0.57lbs per four years), vegetables (minus 0.22lbs), whole grains (minus 0.37 lbs) and fruits (minus 0.49lbs).
Physical activity also reduced weight gain.
The co-author said:
"An average adult gains about one pound per year.
Research Paper Details:
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