The Atkins Dieters' No-Nos include CARBS, which are carbohydrates that are found in many foods such as bread, pasta, and rice. These carbohydrates are high in calories and can cause weight gain if consumed in large amounts. The Atkins Dieters' No-Nos also include sugar, which is a simple carbohydrate that can be found in many processed foods. Sugar can also lead to weight gain if consumed in large amounts.