The gut microbiome can become out of balance, leading to a condition called dysbiosis. The most commonly known cause of dysbiosis is taking prescription antibiotics for an infection. These can kill not just the disease-causing bacteria but beneficial gut bacteria as well. Dysbiosis can also be brought on by unhealthy lifestyle behaviors, such as irregular eating times and high-fat diets. When we’re younger, the effects are so subtle we don’t notice. When we’re older, the effects can be debilitating.