Ha! I've noticed that, too — the use of the word, anyway. (Not necessarily my gut's resting place.) Funny how certain words and phrases go in and out of vogue. I think it's much more noticeable these days due to how much info we consume online.
Homemade sauerkraut and other fermented veggies such as carrots, daikon radishes, onions, and hot peppers! Sauerkraut is the easiest thing in the world to make, just salt and shredded cabbage. I ferment it in the ceramic "pot" pulled out of an old crockpot.