For the study, researchers from the University of Turin followed nearly 1,300 adults over six years. During that time 103 became obese.
Researchers found that study participants who kept their home the warmest in the fall and winter were twice as likely to become obese, compared to people who kept their homes no warmer than 20 degrees Celsius.
Researchers also linked sleep to obesity risk. In fact, for each hour of sleep people typically got each day, the odds of their becoming obese declined by 30 percent, even with other factors like physical activity level and TV watching taken into account.
Diet, a more obvious factor in obesity, also mattered: researchers also found that the more often people ate at restaurants each week, the greater their likelihood of becoming obese. And those who got little fiber in their diets were at greater risk of developing abnormally high blood sugar levels, often a sign of type 2 diabetes.
The findings were published in the International Journal of Obesity.
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