Atkins No-No is a term used to describe food items that are high in carbohydrates and should be avoided on the Atkins Diet. The crossword solution for this term is CARB, which stands for Carbohydrates. Carbohydrates are a type of macronutrient found in many foods, including grains, fruits, vegetables, and dairy products. They provide energy for the body and are an important part of a healthy diet. However, on the Atkins Diet, they should be limited or avoided altogether.