Traditional diets tell you what to eat. They hand you a meal plan, ban entire food groups, and count every calorie. You follow the rules perfectly for weeks or months, lose some weight, then gain it back when the restrictions become unsustainable.
Noom takes a different approach. Instead of dictating what you eat, it teaches you why you eat. The program uses psychology and behavioral science to change your relationship with food, making weight loss sustainable rather than temporary.
At the core of Noom’s system is a simple color-coded food list: green, yellow, and orange. These colors aren’t about “good” or “bad” foods. They’re a portion guide based on calorie density that helps you make informed choices without feeling deprived.
This comprehensive foods list breaks down exactly what falls into each category and how to use the system effectively.
What Is the Noom Diet?
Noom combines psychology with technology through a mobile app that teaches behavioral change rather than strict meal plans. Developed by psychologists and founded in 2010, the program uses cognitive behavioral therapy principles, daily educational lessons, personal coaching, and a color-coded food system to help users build sustainable, healthy habits.
Unlike traditional diets that eliminate foods or require complicated calculations, Noom focuses on calorie density. You log everything you eat, receive short daily lessons (5-15 minutes) about nutrition and behavior, work with a personal coach, and participate in support groups. No foods are forbidden.
Research involving nearly 36,000 users found that approximately 78% experienced weight loss while using the app for an average of 9 months, with 23% losing more than 10% of their starting weight.
Understanding Calorie Density
Calorie density is the foundation of Noom’s color system. It measures calories per gram of food, determining how many calories you consume in a given volume or weight.
The Calorie Density Formula: Calorie Density = Calories per serving ÷ Grams per serving
Foods with low calorie density contain fewer calories per serving. You can eat larger portions and feel full without consuming excessive calories. Foods with high calorie density pack more calories into smaller portions, making it easy to overeat.
Water content is key. The more water a food contains, the lower its calorie density. Fresh fruits and vegetables have high water content and low calorie density. Dried fruits, nuts, and oils have minimal water and high calorie density.
This approach teaches you to choose foods that fill you up with fewer calories, naturally creating the calorie deficit needed for weight loss.
The Color-Coded System Explained
Noom categorizes foods into three colors: green, yellow, and orange (formerly called red). The system acts as a portion control guide rather than a restriction list.
Green Foods: Lowest calorie density. Eat these most often in larger quantities. These foods are nutrient-dense, high in water content, and help you feel full on fewer calories.
Yellow Foods: Moderate calorie density. Enjoy in balanced, moderate portions. These foods provide good nutrition but require more portion awareness than green foods.
Orange Foods: Highest calorie density. Eat less often and in smaller amounts. These aren’t forbidden, but you need mindful portions since they pack many calories into small servings.
The goal isn’t perfection. Noom recommends that approximately 30% of your daily calories come from green foods, 45% from yellow foods, and 25% from orange foods. The app tracks this automatically as you log meals.
Noom’s Massive Food Database
Noom’s food database contains 3.7 million different foods. You can search by typing food names, scanning barcodes, or looking up meals from over 850 restaurants and chains.
This extensive database means virtually everything you eat has already been categorized. The app shows you immediately whether a food is green, yellow, or orange, making it easy to make informed choices in real time.
Green Foods List (Lowest Calorie Density)
Green foods should form the foundation of your meals. These are the most nutrient-dense, lowest-calorie options that help you feel satisfied while losing weight.
Vegetables (Most Are Green)
Leafy greens:
- Spinach
- Kale
- Lettuce (all varieties)
- Swiss chard
- Arugula
- Collard greens
- Romaine
Cruciferous vegetables:
- Broccoli
- Cauliflower
- Brussels sprouts
- Cabbage
- Bok choy
Other vegetables:
- Bell peppers
- Cucumbers
- Tomatoes
- Carrots
- Celery
- Mushrooms
- Zucchini
- Yellow squash
- Asparagus
- Green beans
- Eggplant
- Onions
- Radishes
- Snap peas
Fruits (Most Common Ones)
- Apples
- Blueberries
- Strawberries
- Raspberries
- Blackberries
- Watermelon
- Cantaloupe
- Honeydew
- Peaches
- Pears
- Plums
- Cherries
- Grapes
- Bananas
- Oranges
- Grapefruit
Whole Grains
- Brown rice
- Quinoa
- Oatmeal (plain, not instant packets)
- Whole grain bread (check specific brands)
- Whole wheat pasta
Proteins
- Tofu
- Tuna (canned in water)
- White fish (cod, tilapia, halibut)
- Shrimp
- Scallops
Dairy and Alternatives
- Non-fat yogurt (plain)
- Non-fat Greek yogurt (plain)
- Non-fat milk
- Skim milk
- Non-fat cheese
- Unsweetened almond milk
Other Green Foods
- Vegetable broth
- Salsa (check for added sugar)
- Pickles (low sodium)
- Sauerkraut
- Kimchi
Why these work: High water and fiber content mean you can eat satisfying portions without consuming many calories. These foods provide essential vitamins, minerals, and nutrients your body needs.
Yellow Foods List (Moderate Calorie Density)
Yellow foods are nutritious but more calorie-dense than green foods. These should make up the bulk of your protein intake and can be enjoyed in moderate portions.
Lean Proteins
- Grilled chicken breast
- Turkey breast
- Ground turkey (lean)
- Lean ground beef (90% lean or higher)
- Salmon
- Tuna steaks
- Eggs (whole)
- Lean pork
Legumes and Beans
- Black beans
- Chickpeas
- Lentils
- Kidney beans
- Pinto beans
- Edamame
- Tempeh
Grains and Starches
- White rice
- White pasta
- Whole-grain tortillas
- Pita bread
- Bagels (small)
- English muffins
- Couscous
Dairy
- Low-fat yogurt
- Low-fat milk
- Low-fat cheese
- Part-skim mozzarella
- Feta cheese
Other Yellow Foods
- Avocado
- Hummus
- Olives
- Popcorn (air-popped or light)
Why these work: These foods provide important nutrients and protein, but have higher calorie density than green foods. Portion control helps you stay within your calorie budget while getting adequate nutrition.
Orange Foods List (Highest Calorie Density)
Orange foods (formerly called “red” foods) are the most calorie-dense options. They’re not banned or forbidden, but eating them requires awareness and smaller portions.
Oils and Fats
- Olive oil
- Coconut oil
- Avocado oil
- Vegetable oils
- Butter
- Margarine
Nuts and Seeds
- Almonds
- Cashews
- Walnuts
- Pecans
- Pistachios
- Peanuts
- Chia seeds
- Flaxseeds
- Sunflower seeds
- Pumpkin seeds
Nut Butters
- Peanut butter
- Almond butter
- Cashew butter
- Coconut butter
Dried Fruits
- Raisins
- Dried cranberries
- Dried apricots
- Dried mango
- Dates
Processed Foods
- White bread
- Croissants
- Biscuits
- Muffins
- Donuts
- Pastries
- Cookies
- Cakes
- Ice cream
- Candy
- Chips
- Crackers (most varieties)
- French fries
Full-Fat Dairy
- Whole milk
- Full-fat cheese
- Cream cheese
- Cottage cheese (full-fat)
- Full-fat yogurt
- Half and half
- Heavy cream
- Sour cream
Meats
- Bacon
- Sausage
- Hot dogs
- Deli meats (processed)
- Fatty cuts of beef
- Fatty cuts of pork
- Dark meat chicken with skin
Sweets and Desserts
- Chocolate
- Candy bars
- Gummy candies
- Brownies
- Pie
- Cake
- Ice cream
Beverages
- Soda (regular)
- Fruit juices
- Energy drinks (sweetened)
- Sweetened coffee drinks
- Alcohol (beer, wine, spirits)
- Sweetened teas
Important note: Diet sodas and artificially sweetened drinks are labeled yellow (not green) despite having zero calories. Noom considers them highly processed with low satiety value.
Why awareness matters: These foods pack many calories into small portions. A handful of nuts provides the same calories as a large salad. That doesn’t make nuts bad, but it means you need to be mindful of portions to stay within your calorie budget.
How to Use the Color System Effectively
Fill your plate strategically. Start with green foods covering half your plate. Add yellow foods (proteins, whole grains) to one quarter. Use orange foods as flavor enhancers or small treats in the remaining quarter.
Don’t fear orange foods. The color system is a guide, not a restriction. You can eat orange foods daily as long as you balance them with green and yellow options and watch portions.
Make smart swaps. Instead of eliminating foods you love, look for green or yellow alternatives. Swap white rice (yellow) for cauliflower rice (green). Choose air-popped popcorn (yellow) instead of chips (orange). Use Greek yogurt (green) instead of sour cream (orange).
Track everything honestly. Log all foods and drinks in the app, even small bites or tastes. The color feedback helps you learn which foods support your goals and which require more awareness.
Focus on green foods when hungry. If you’re truly hungry between meals, reach for green foods. You can eat larger portions without derailing your calorie budget.
Save orange foods for when they matter. Don’t waste calories on orange foods you don’t really want. If you’re going to eat something calorie-dense, make it something you truly enjoy and savor it mindfully.
The Psychology Component
Noom’s true differentiator isn’t the food lists. It’s the psychological approach to changing your relationship with food.
Daily lessons teach you:
- Why do you eat when you’re not physically hungry
- How to identify emotional eating triggers
- Understanding hunger versus cravings
- Building sustainable habits instead of relying on willpower
- Cognitive behavioral therapy techniques for food-related thoughts
- Portion control psychology
- How to handle setbacks without giving up
Personal coaching provides:
- Accountability and support
- Troubleshooting when you struggle
- Motivation during plateaus
- Guidance on applying lessons to your life
Group support offers:
- Connection with others on the same journey
- Shared experiences and strategies
- Encouragement when motivation wanes
This psychological foundation is why Noom users maintain weight loss long-term. You’re not just following rules. You’re understanding the underlying behaviors that led to weight gain and actively changing them.
Sample Noom Day
Breakfast: Greek yogurt (green) with blueberries (green) and a drizzle of honey (orange). Whole grain toast (green) with a thin spread of almond butter (orange).
Morning Snack: Apple (green) with 10 almonds (orange).
Lunch: Large spinach salad (green) with grilled chicken (yellow), cherry tomatoes (green), cucumbers (green), bell peppers (green), and balsamic vinaigrette (orange, light portion). Side of whole grain crackers (yellow).
Afternoon Snack: Carrot sticks (green) with hummus (yellow).
Dinner: Grilled salmon (yellow) with roasted broccoli (green) and quinoa (green). Small side salad (green) with olive oil and lemon (orange, small amount).
Evening Treat: Small portion of dark chocolate (orange) or air-popped popcorn (yellow).
Beverages Throughout Day: Water (green), black coffee (green), unsweetened tea (green).
Notice: No foods are forbidden. The day includes orange foods (almond butter, honey, dressing, olive oil, chocolate) but in small, mindful portions balanced with abundant green and moderate yellow foods.
Common Questions About Noom Foods
Are any foods completely off-limits? No. Noom doesn’t ban any foods. The color system teaches you to balance higher-calorie foods with lower-calorie options.
Can I eat orange foods every day? Yes. Orange foods should typically make up about 25% of your daily calories. The key is portion control and balance.
Why are healthy fats like olive oil and nuts orange? Calorie density. While nutritionally beneficial, fats contain 9 calories per gram compared to 4 calories per gram for protein and carbs. Small portions add up quickly.
Do I have to count calories? Yes, Noom involves calorie tracking. The app calculates your personalized daily calorie budget based on your weight loss goals. However, the color system makes calorie awareness more intuitive than traditional counting.
Can vegetarians and vegans use Noom? Absolutely. The color system applies to all eating styles. You simply focus on plant-based options within each color category.
What about restaurant meals? The app includes meals from 850+ restaurants and chains, already color-coded. This makes eating out while using Noom straightforward.
Tips for Success on Noom
Start your day with green. Beginning with a green breakfast (like oatmeal with fruit or a vegetable omelet) sets a positive tone and fills you up on fewer calories.
Prep green foods in bulk. Wash and chop vegetables on weekends. Having green foods ready makes healthy choices easier when you’re hungry.
Read labels. Two similar products can fall into different color categories based on ingredients and calorie density. Compare options to find the best choice.
Drink water. Sometimes hunger is actually thirst. Staying hydrated helps you distinguish true hunger from other signals.
Plan for orange foods. If you know you want pizza for dinner, plan lighter green-focused meals earlier in the day. This lets you enjoy what you want while staying in your calorie budget.
Don’t skip meals. Extreme hunger leads to poor choices. Eating regular meals with green and yellow foods keeps you satisfied and in control.
Log before you eat. Seeing the color breakdown before consuming a meal helps you make adjustments if needed.
Give it time. The behavioral changes take weeks to solidify. Most users see significant results after consistently using the program for 3-4 months.
Who Should Try Noom
Noom works particularly well for people who:
- Understand basic nutrition, but struggle with consistency
- Recognize emotional or behavioral eating patterns
- Have failed at restrictive diets repeatedly
- Want to learn sustainable habits rather than follow temporary rules
- Prefer app-based tracking and support
- Can afford the monthly subscription ($17-$70 depending on plan length)
- Don’t have triggers around food tracking or daily weigh-ins
Who Might Need a Different Approach
Noom may not be ideal if you:
- Have a history of eating disorders or disordered eating
- Find food tracking or daily weigh-ins psychologically harmful
- Need in-person support and accountability
- Prefer structured meal plans over flexible guidelines
- Have specific medical conditions requiring specialized nutrition (consult healthcare providers first)
The Bottom Line
The Noom diet revolutionizes weight loss by treating it as a psychological challenge rather than just a physical one. The color-coded food system based on calorie density makes nutrition intuitive without banning foods or requiring complicated calculations.
Green foods (lowest calorie density) should form your foundation. Yellow foods (moderate calorie density) provide important nutrition in balanced portions. Orange foods (highest calorie density) aren’t forbidde,n but require mindful portions and balance.
The psychology-based approach achieves results because it addresses why you eat, not just what you eat. Daily lessons teach cognitive behavioral techniques. Personal coaching provides accountability. Support groups offer encouragement.
The 3.7 million food database means you can find and track virtually anything you eat. The color feedback is immediate, helping you learn which choices support your goals.
Success with Noom requires consistent engagement. Log your meals daily. Read the lessons. Work with your coach. Participate in your support group. The time investment pays off with sustainable behavior change rather than temporary weight loss.
No foods are off-limits. The system teaches balance and awareness. You learn to make choices that align with your goals while still enjoying the foods you love in appropriate portions.
Use this comprehensive foods list to understand which everyday items fall into each category. Stock your kitchen with abundant green foods. Include yellow foods for protein and satisfaction. Enjoy orange foods mindfully as treats or flavor enhancers.
The Noom approach works because it’s sustainable. You’re not following someone else’s meal plan or eliminating entire food groups. You’re learning to make informed choices based on calorie density, building habits that last beyond the program.
Weight loss isn’t just about willpower. It’s about understanding your behaviors, identifying triggers, and creating new patterns. Noom provides the psychological tools and nutritional framework to make those changes permanent.
This article provides educational information about the Noom diet and its food categorization system. It does not replace personalized medical or nutritional advice. Consult qualified healthcare providers before starting any weight loss program, especially if you have medical conditions, take medications, or have a history of eating disorders. Individual results vary based on adherence, health status, and other factors.
