Atkins

'Atkins' refers to a diet low in carbohydrates that can help a person lose weight. When Dr. Atkins first developed his diet in the 70s, the mainstream medical establishment was quick to dismiss him as a quack, as his beliefs flew in the face of conventional wisdom at the time. Today, after the failed low-fat diet fad of the 90s, which only made Americans fatter, low-carb diets in general and Atkins specifically are quite popular.

Example:
-Are you following any special diet to help you lose weight?
-Atkins.