24 Unexpected Foods That Can Wreck Your Digestive System

19. Moldy or Poor-Quality Coffee: The Mycotoxin Risk

Coffee itself isn’t the enemy—in fact, high-quality coffee contains polyphenols that may benefit the microbiome. However, poorly stored or low-grade coffee beans can harbor mold and mycotoxins, which can wreak havoc on the gut lining and overall immune function. People with gut sensitivities or autoimmune conditions may be especially vulnerable. Choosing organic, mold-tested coffee brands can help minimize this risk while preserving your morning ritual.

20. Protein Bars and Meal Replacements: The Faux Health Food

Often marketed as health-conscious choices, many protein bars and shakes are packed with artificial flavors, sugar alcohols, emulsifiers, and processed soy. These ingredients can bloat, irritate, and disrupt gut flora—especially in sensitive individuals. While convenient, these products frequently sacrifice gut health for shelf stability and flavor. Look for clean, whole-food-based options with minimal ingredients—or better yet, make your own bars at home.