Every year the company I work for (Hyland Software) sponsors a "Holiday Hold". I think a lot of companies implement similar programs whether on a enterprise level or in specific divisions or departments. Some acquaintances have said that their company does it on a departmental basis. Hyland does it on an company-wide basis.
The Holiday Hold is a challenge to keep your weight the same or reduce it over the Holidays. According to the study linked to Americans on average gain only one pound over the holidays - but that pound is a pound that is never lost. So after thirty years Americans on average will gain 30 pounds. Of course I added that amount of weight in two years after quitting smoking.
So this year, both Arisa and I are taking the challenge.