Conflict over New England Medical Journal Report

In my last post, I had conflicting information from two different and well known sources both citing the New England Medical Journal.

In an associated press release, it was reported that the average American gains about 5lbs over the holiday season. While Self Magazine reported that actual weight gain is around 1lbs between Thanksgiving and New Year's.
Turns out Self did their homework!! Here's the abstract from the article in NEMJ:

A Prospective Study of Holiday Weight Gain

Jack A. Yanovski, M.D., Ph.D., Susan Z. Yanovski, M.D., Kara N. Sovik, B.S., Tuc T. Nguyen, M.S., Patrick M. O'Neil, Ph.D., and Nancy G. Sebring, M.Ed., R.D.

ABSTRACT:
Background: It is commonly asserted that the average American gains 5 lb (2.3 kg) or more over the holiday period between Thanksgiving and New Year's Day, yet few data support this statement.

Methods: To estimate actual holiday-related weight variation, we measured body weight in a convenience sample of 195 adults. The subjects were weighed four times at intervals of six to eight weeks, so that weight change was determined for three periods: preholiday (from late September or early October to mid-November), holiday (from mid-November to early or mid-January), and postholiday (from early or mid-January to late February or early March). A final measurement of body weight was obtained in 165 subjects the following September or October. Data on other vital signs and self-reported health measures were obtained from the patients in order to mask the main outcome of interest.

Results: The mean (±SD) weight increased significantly during the holiday period (gain, 0.37±1.52 kg; P<0.001), but not during the preholiday period (gain, 0.18±1.49 kg; P=0.09) or the postholiday period (loss, 0.07±1.14 kg; P=0.36). As compared with their weight in late September or early October, the study subjects had an average net weight gain of 0.48±2.22 kg in late February or March (P=0.003). Between February or March and the next September or early October, there was no significant additional change in weight (gain, 0.21 kg±2.3 kg; P=0.13) for the 165 participants who returned for follow-up.

Conclusions: The average holiday weight gain is less than commonly asserted. Since this gain is not reversed during the spring or summer months, the net 0.48-kg weight gain in the fall and winter probably contributes to the increase in body weight that frequently occurs during adulthood.

Check out this link to view the full article
 
 
** 1 kilogram = 2.20462262 pounds