11 'Sugar-Free' Traps: Foods That Still Spike Blood Glucose Levels

5. Sugar-Free Protein Bars

Often labeled as “keto,” “low-carb,” or “diabetic-friendly,” many sugar-free protein bars are anything but. They commonly include glucose-spiking ingredients like maltodextrin, glycerin, or tapioca starch—used as binders or bulkers. While they may not taste overtly sweet, their glycemic impact can be surprisingly high. Some bars also use sugar alcohols like erythritol or sorbitol, which may affect individuals differently and still disrupt digestion. When paired with minimal fiber and poor-quality protein, these bars become little more than candy in fitness branding. For real metabolic stability, look for bars with whole food ingredients, healthy fats, and visible fiber.