Dante Carrillo
The Noom diet is a psychology-based program that operates with the core belief of balance. It separates foods by color—green, yellow, and red—to help users decide what they should and shouldn't eat to be healthy. The green foods are the best, yellow foods are slightly less nutritious, and red foods are the most calorie-dense.
| Characteristics | Values |
|---|---|
| Based on | Evidence-based information |
| Core belief | Balance |
| Food categories | Green, yellow, and red |
| Green foods | Best |
| Yellow foods | Slightly less nutritious |
| Red foods | Most calorie-dense |
| Foods in yellow category | More calories or fewer healthy nutrients per serving than green foods |
| Foods in yellow category | Lean meat, starches, vegetarian, vegan-friendly protein sources |
| Foods in yellow category | Greek yogurt, avocado, whole-grain tortillas, popcorn, low-sodium canned soups, instant potatoes |
| Foods in green category | Least calorie-dense and most nutrient-dense |
| Foods in green category | Vegetables and whole grains |
| Recognition | U.S. News & World Report's Best Diets of 2025 |
What You'll Learn
Color-coded food tracking
The Noom diet is a psychology-based program that operates with the core belief of balance. The diet separates foods by color—green, yellow, and red—to help users decide what they should and shouldn't eat to be healthy.
The green foods are the best, the yellow foods are slightly less nutritious, and the red foods are the most calorie-dense. The ideal diet is comprised of mostly green foods, some yellow foods, and a limited amount of red foods.
The green foods are the least calorie-dense and most nutrient-dense options, typically vegetables and whole grains. The yellow foods have more calories or have fewer healthy nutrients per serving than green foods. These types of food can still be incorporated into your routine, but not as frequently as green foods. A handful of yellow foods are lean meat and starches like turkey breast, grilled chicken, tuna, salmon, and lean beef. However, there are also vegetarian and vegan-friendly protein sources like eggs, black beans, and chickpeas. The yellow category also contains a few somewhat random items like greek yogurt, avocado, and whole-grain tortillas. Other yellow foods are popcorn, low-sodium canned soups, and instant potatoes.
The red foods are the most calorie-dense. The ideal diet is comprised of mostly green foods, some yellow foods, and a limited amount of red foods.
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Nutrient-dense green foods
The Noom diet is a psychology-based program that operates with the core belief of balance. In terms of food, the diet breaks items into three categories: green, yellow, and red. The green foods are the best, yellow foods are slightly less nutritious, and red foods are the most calorie-dense. Ideally, your diet is comprised of mostly green foods, some yellow foods, and a limited amount of red foods.
The Noom diet separates foods by color—green, yellow, and red—to help users decide what they should and shouldn't eat to be healthy. The green foods are the least calorie-dense and most nutrient-dense options. These are typically vegetables and whole grains.
The yellow foods have more calories or have fewer healthy nutrients per serving than green foods. These types of food can still be incorporated into your routine, but not as frequently as green foods. A handful of yellow foods are lean meat and starches like turkey breast, grilled chicken, tuna, salmon, and lean beef. However, there are also vegetarian and vegan-friendly protein sources like eggs, black beans, and chickpeas. The yellow category also contains a few somewhat random items like Greek yogurt, avocado, and whole-grain tortillas. Other yellow foods are popcorn, low-sodium canned soups, and instant potatoes!
The red foods are the most calorie-dense and are least nutrient-dense.
The Noom diet is one of U.S. News & World Report's Best Diets of 2025.
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Yellow foods have fewer nutrients
The Noom diet is a psychology-based program that operates with the core belief of balance. It separates foods by color—green, yellow, and red—to help users decide what they should and shouldn't eat to be healthy. The green foods are the best, yellow foods are slightly less nutritious, and red foods are the most calorie-dense.
The green foods are the least calorie-dense and most nutrient-dense options. These are typically vegetables and whole grains. The yellow foods have more calories or have fewer healthy nutrients per serving than green foods. These types of food can still be incorporated into your routine, but not as frequently as green foods. A handful of yellow foods are lean meat and starches like turkey breast, grilled chicken, tuna, salmon, and lean beef. However, there are also vegetarian and vegan-friendly protein sources like eggs, black beans, and chickpeas. The yellow category also contains a few somewhat random items like greek yogurt, avocado, and whole-grain tortillas. Other yellow foods are popcorn, low-sodium canned soups, and instant potatoes.
The red foods are the most calorie-dense. Ideally, your diet is comprised of mostly green foods, some yellow foods, and a limited amount of red foods. The Noom diet is one of U.S. News & World Report's Best Diets of 2025.
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Red foods are calorie-dense
The Noom diet is a psychology-based program that operates with the core belief of balance. In terms of food, the diet separates items into three categories: green, yellow, and red. The green foods are the least calorie-dense and most nutrient-dense options. These are typically vegetables and whole grains. The yellow foods have more calories or fewer healthy nutrients per serving than green foods. These types of food can still be incorporated into your routine, but not as frequently as green foods. A handful of yellow foods are lean meat and starches like turkey breast, grilled chicken, tuna, salmon, and lean beef. The red foods are the most calorie-dense. Ideally, your diet is comprised of mostly green foods, some yellow foods, and a limited amount of red foods.
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Psychology-based program
The Noom diet is a psychology-based program that operates with the core belief of balance. It separates foods by color—green, yellow, and red—to help users decide what they should and shouldn't eat to be healthy. The green foods are the best, yellow foods are slightly less nutritious, and red foods are the most calorie-dense.
The green foods are the least calorie-dense and most nutrient-dense options and are typically vegetables and whole grains. The yellow foods have more calories or have fewer healthy nutrients per serving than green foods and can still be incorporated into your routine, but not as frequently as green foods. A handful of yellow foods are lean meat and starches like turkey breast, grilled chicken, tuna, salmon, and lean beef. However, there are also vegetarian and vegan-friendly protein sources like eggs, black beans, and chickpeas. The yellow category also contains a few somewhat random items like greek yogurt, avocado, and whole-grain tortillas. Other yellow foods are popcorn, low-sodium canned soups, and instant potatoes. The red foods are the most calorie-dense and should be limited.
The Noom diet is one of U.S. News & World Report's Best Diets of 2025. It is comprised of evidence-based information, trained cognitive behavior coaches, simple tracking tools, and a user-friendly interface. The diet breaks items into three categories: green, yellow, and red, and ideally, your diet is comprised of mostly green foods, some yellow foods, and a limited amount of red foods.
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Frequently asked questions
The Noom diet is a psychology-based program that operates with the core belief of balance. It separates foods by color—green, yellow and red—to help users decide what they should and shouldn't eat to be healthy.
The Noom diet breaks items into three categories: green, yellow, and red. The green foods are the best, yellow foods are slightly less nutritious, and red foods are the most calorie-dense.
The green foods are the least calorie-dense and most nutrient-dense options. These are typically vegetables and whole grains.
The yellow foods have more calories or have fewer healthy nutrients per serving than green foods. These types of food can still be incorporated into your routine, but not as frequently as green foods. A handful of yellow foods are lean meat and starches like turkey breast, grilled chicken, tuna, salmon, and lean beef.
