One way to avoid adding extra pounds over the holiday season is by relying on the glycemic index to choose your foods and snacks. The glycemic index is a measure of how fast carbohydrates are turned into sugar. The higher a food’s glycemic index, the faster your body turns that food into sugar, and the sooner the “hunger bell” rings again. This can set into motion the cycle of holiday overeating. One way to go low glycemic: Choose foods your grandmother used to eat—ones that resemble things in nature, and don’t come with long lists of ingredients.