 investigated the increases in A1C and fasting plasma glucose in type 2 diabetic patients, to see whether these increases were steady throughout the year or varied seasonally.They concluded that the winter holidays did influence the glycemic control of the patients, with the largest increases being during that period, increases that "might not be reversed during the summer and autumn months".The Christmas and holiday season, according to a survey by the ADA, is the second most popular reason, after birthdays, for sharing food in the workplace.