I don't consider it a fad diet by any means. Ketones are arguably a much more efficient and cleaner fuel. There are 'dirty keto' followers who obviously don't incorporate much moderation into their eating which isn't good no matter what menu you might be hoping to follow. Switching from a keto diet to a high carb foods would mean fueling inflammation and pain in a variety of ways for those doing keto, many high-carb foods wreak havoc on the body when consumed in high amounts they fuel chronic inflammation which underlines a great deal of illness today. There are serious negative health consequences that come along with that so I can see why many people would stick with it for life. It isn't a fad, it is about being healthy and feeling your best. A diverse microbiome is the best sort. 👍👍