People are different - who guessed. The two main problems are: 1) Popular science & media don't understand how the gut works enough to actually give beneficia

People are different - who guessed. The two main problems are: 1) Popular science & media don't understand how the gut works enough to actually give beneficial advice en-masse. 2) The 'Fad' is the food industry selling even more processed junk under the moniker of 'Gluten Free' in the same way that 'Low Fat' and 'Sugar Free' foods are often worse overall nutritionally than those they replace. As usual, the elephant in the room is how there's no real downside to a sugar-free diet, but the food industry don't want that as food isn't as addictive.