The Noom diet is a psychology-based program that operates with the core belief of balance. It is a comprehensive wellness plan that includes food, exercise, and mental health aspects built-in. The program focuses on behavioral changes and encourages you to eat low calorie, nutrient-dense foods. Noom aims to help you lose weight by creating a calorie deficit, which occurs when you consistently consume fewer calories than you burn each day. Noom estimates your daily calorie needs based on your sex, age, height, weight, and answers to a series of lifestyle questions. The program does not restrict any ingredients, but it sorts foods into three different lists: green, yellow, and orange. Each color signifies how much or how little you should eat to stay on track toward your goals. Green foods are the best, yellow foods are slightly less nutritious, and red foods are the most calorie-dense. Noom encourages consuming less of calorie-dense foods, such as nuts, desserts, and other treats, but it does not forbid these items. Nooms library of recipes helps you determine which foods and recipes are appropriate for you based on any food allergies or intolerances you may have.

Positive aspects of the Noom diet include its focus on behavioral changes, flexibility in food choices, and comprehensive wellness plan. The program also offers advice to help you prevent or manage chronic diseases like high blood pressure and diabetes. Noom connects users to live coaches and allows them to receive many forms of 1-on-1 coaching during business hours.

Negative aspects of the Noom diet include its focus mostly on increasing weight loss rather than improving overall health. Some users may find the programs color-coded system complex and difficult to follow.

Ingredients or materials are not applicable to the Noom diet as it is a behavioral-based program that does not involve any specific food products or supplements.