Is keto still worth building for, or has the moment passed?

Treat it as one durable face of a larger shift: guests who manage carbohydrates for medical, fitness or lifestyle reasons and read menus with a veto in hand. The label on the trend changes; the buying behaviour — protein-forward, carb-aware, ingredient-literate — has stayed and grown in this region. Build the lane for that behaviour and it survives whatever the trend is called next year.

From Why Fast Food Needs a Keto Lane — the full reading, with the method behind this answer.