For individuals with Irritable Bowel Syndrome (IBS), eating cheese is often a matter of selecting the right variety rather than a complete avoidance. While many dairy products are high in lactose—a sugar that can trigger gas, bloating, and diarrhea in those with sensitivities—many hard and aged cheeses are naturally low in lactose. This is because the aging process allows bacteria to break down the lactose into lactic acid. Options like cheddar, parmesan, swiss, and brie are typically well-tolerated in moderate portions. However, it is important to be mindful of fat content, as high-fat foods can slow down digestion or trigger "gastrocolic reflex" spasms in some IBS patients. For those following a Low FODMAP diet, these aged cheeses are generally considered safe, but soft, unripened cheeses like ricotta or cottage cheese should be limited or replaced with lactose-free alternatives to prevent symptom flare-ups.