According to the National Institutes of Health the average American adult gains one pound every holiday season. Those who are already overweight tend to gain even more. Unfortunately that weight is usually there to stay; holiday weight gain is the primary reason weight creeps upwards with age. With so many reasons to overeat during the holidays, it’s surprising we don’t gain more. The holidays are traditionally a time for feasting and drinking. But historically, this occurred in the context of food scarcity; many pilgrims starved to death before food sources were established, and abundance was something to be celebrated. We hardly need to celebrate food abundance today, but that hasn’t stopped us from bringing out the cookies, cakes and pies for the holidays. We combine this with alcohol, which impairs inhibitions, stimulates appetite and intensifies the brain’s reward center in response to food! Then there’s stress. Our already challenging to-do lists expand during the holida…