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Be mindful of your protein powder. One of the main culprits for bloating in smoothies is a protein powder, according to Serena Poon, a celebrity chef and certified nutritionist. That’s why it’s so important to read the fine print of the ingredient list, so you know the source of the protein. “Whey protein contains lactose, which can cause digestive discomfort in some people,” Poon says. Additionally, she says some may be sensitive to sugar alcohols, including erythritol, sorbitol, xylitol, and maltitol. These are often added to powders to avoid adding calorierich sugar but could result in an upset tummy. If you’re looking for a clean protein powder, check out our list of The Healthiest Protein Powders for Weight Loss.