Simply Whey is designed to be the perfect nutritious snack for those who are gluten or soy intolerant and also for those who have nut allergies. Like the Simply Bar, Simply Whey has the most protein (15g) with the least calories (140cal) of any natural food bar. Protein keeps you feeling fuller, longer. Each bar has more fiber than sugar, no sugar alcohols, and is low glycemic. Protein in your diet can keep your energy levels most sustained and equal compared to sugar packed protein bars.