Peter Gibson, the guy who discovered non-celiac gluten sensitivity, retracted his own study a few years later, but it had already become a fad diet, so it just stuck. That being said, there have been some studies that seem to confirm its existence, but the evidence is pretty thin. (To be clear, celiac disease and wheat allergies are 100% proven and can be reliably tested for).
Peter Gibson, the guy who discovered non-celiac gluten sensitivity, retracted his own study a few years later, but it had already become a fad diet, so it just stuck. That being said, there have been some studies that seem to confirm its existence, but the evidence is pretty thin. (To be clear, celiac disease and wheat allergies are 100% proven and can be reliably tested for).
A lot of people’s gluten sensitivity is actually a sensitivity to glysophates.