Getty ImagesWorried about holiday weight gain? Apart from the obvious -- eat a little less, exercise a little more -- the Health Blog can't help you. But, thanks to the magic of science, we can tell you just how much weight you're likely to gain.

First, check out this 2006 Thanksgiving study from Nutrition Journal. Researchers at the University of Oklahoma weighed 94 students before and after Thanksgiving break. They found that the students gained just over one pound, on average, with only a small difference between men and...