Based on data from the online grocer FreshDirect, many customers fail to keep their New Year's Resolutions. The retailer recently reported that customers' liquor and wine consumption picked up by about 40 percent in the first two weeks of February—while juice-cleanse sales dropped by 25 percent. Shoppers also bought 15 percent more ice cream and desserts, and 35 percent more pizza, in early February than during the first two weeks of January.

A study by Foursquare and Swarm shows that February 4th (37 days after New Year's) is the day people are most likely to fall off the wagon. The apps analyzed users' check-ins and found that date marks an uptick in visits to fast-food joints and a downturn in trips to the gym.