Daily Protein Bars May Cause Digestive Issues and Nutritional Imbalance, Experts Warn

Protein bars have surged in popularity as a convenient source of protein, available in supermarkets, pharmacies, and gyms, often tasting more like desserts than functional foods. However, clinical dietitian Kelsey Konik, speaking to Tasting Table, cautions that while eating a protein bar daily is unlikely to harm most people, it is not advisable as a regular habit. She emphasizes that protein bars are best used as a quick solution when a full meal is not possible, post-workout, or when appetite is low, but they cannot replace a diet based on whole foods, which provide a broader range of nutrients, vitamins, minerals, and antioxidants.

Konik also highlights that many protein bars contain artificial sweeteners, sugar alcohols, and high amounts of processed fiber, which can cause bloating, gas, stomach pain, or digestive discomfort, especially with daily consumption. Excess protein intake does not necessarily benefit the body and may lead to constipation, reduced energy levels, and mood changes if it replaces complex carbohydrates. A 2023 study in the Journal of Functional Foods found that consuming excess protein bars without corresponding physical activity may increase body fat.

For those who regularly consume protein bars, experts recommend scrutinizing ingredient lists rather than focusing solely on protein content. Ideal bars should contain at least 3 grams of fiber, less than 10% added sugar relative to daily recommended intake, and a short, simple ingredient list. However, after prolonged endurance exercise, slightly higher sugar content may help replenish energy stores.