I realized I had gut health issues around five years ago, when I started noticing symptoms like bloating becoming way more common in my day-to-day life. It got especially bad after eating certain foods (looking at you, pizza), but I had no idea how to narrow down what my sensitivities were at the time.
Eventually, I did what most people do: Struggle to book an appointment with a gastroenterologist, take several unrelated blood tests, and pay for multiple follow-up appointments before I finally met the low FODMAP diet, a plan that limits consumption of naturally occurring fermentable sugars, and which (thankfully) changed my life in the long run.