“Gluten-free diets only provide health benefits for people with celiac disease or gluten sensitivity; for everyone else, switching from regular bread to gluten-free bread changes almost nothing about health except price and taste." (Caption version: "Gluten only matters if you have celiac disease or a real sensitivity. For everyone else,…”

On the core claim (no benefit for the general population): The evidence supports it. Harvard Health states plainly that there is no compelling evidence that a gluten-free diet will improve health or prevent disease if you don't have celiac disease and can eat gluten without trouble. Peer-reviewed reviews concur that while evidence showing that the gluten-free diet has a positive impact on everybody's health is weak, people with specific gluten-related disorders may benefit from it. On gluten itself being harmful to non-celiac people: The largest relevant cohort found no cardiovascular signal from eating gluten. In the BMJ study, adjusted analysis showed there was no significant association between gluten intake and coronary heart disease. Notably, the direction of concern ran the other way: after additional adjustment for intake of refined grains, estimated gluten consumption was associated with a lower risk of coronary heart disease, and avoidance of gluten can result in less consumption of healthy whole grains, which can also affect cardiac risk. On the "changes almost nothing except price and taste" framing: This is where the evidence diverges from the claim. Product-composition studies repeatedly find gluten-free bakery items are nutritionally different, not equivalent. In a large product database, protein content was significantly lower in GF foods (5.8 g/100 g) than gluten-containing foods (8.6 g/100 g), although energy content, carbohydrate, total fat, saturated fatty acids, fiber and sugar did not differ between GF and gluten-containing products. The Italian market analysis found the protein content of GF food is lower in all the categories. A Swedish bread-specific study found gluten-free bread had a lower Health Star Rating than gluten-containing bread (mean 3.5 vs. 3.8) and concluded gluten-free bread products were slightly unhealthier due to a lower protein content. Broader reviews note several GF foodstuffs contain more fat, including saturated, and salt, but less minerals and vitamins than their equivalent with gluten, and that going gluten-free without need carries detrimental effects, including loss of the dietary fiber and nutrient deficiencies. On the "or a real sensitivity" qualifier: This category is less solid than the post implies. A pooled analysis of double-blind challenges found that only 38 of 231 NCGS patients (16%) showed gluten-specific symptoms, and 40% of these subjects had a nocebo response. A randomized crossover trial concluded that in individuals with self-reported non-celiac gluten sensitivity, fructans induced symptoms rather than gluten. Clinical reviews similarly note that gluten-free diets may benefit a subset of patients with IBS and suspected non-celiac gluten sensitivity; however, in the absence of celiac disease, symptom improvement is often attributed to fructan restriction and placebo effects rather than to gluten elimination itself. On the two-condition framing: The medically recognized indications are broader than "celiac or sensitivity." Reviews list the gluten-free diet as treatment for celiac disease, dermatitis herpetiformis, gluten ataxia, wheat allergy, and non-celiac gluten sensitivity, with gluten-related disorders grouped as immune-mediated disorders including celiac disease, dermatitis herpetiformis, and gluten ataxia; allergic reactions, such as wheat allergy; and non-celiac gluten sensitivity. On price: Supported. GF products were more expensive (overall 183%) in all regions and venues, and mass-market GF products were 139% more expensive than the wheat-based version of the same product.