Noom uses a system that separates "good" and "bad" foods by assigning colors to different edible treats. Each color signifies how much or how little you should eat to stay on track toward your goals.

BOTTOM LINE: The Noom diet encourages you to eat low calorie, nutrient-dense foods and monitors your progress via a mobile app. Although its well-established methods are likely effective, it focuses mostly on increasing weight loss rather than improving overall health.

The app encourages you to log daily blood pressure readings, blood glucose levels and water intake. The Noom plan is designed to last 16 weeks, but you're encouraged to buy up to twelve months at a time for weight loss and maintenance.

Some research suggests that Noom does help people lose weight. In one study, 78% of people lost weight while using Noom, and 23% lost more than 10% of their body weight. Dieting is hard, no matter what approach you take.

Some Noom users say the app's daily weigh-ins and calorie-tracking system are 'toxic' and triggered disordered eating. The weight-loss app Noom built its brand on acknowledging that "diets don't work." Former users say they were drawn to Noom's message, but the app triggered disordered eating.

Focuses on calorie and nutrient density Noom emphasizes calorie density, a measure of how many calories a food or beverage provides relative to its weight or volume. The program categorizes foods by color - green, yellow, or orange - based on their calorie density and nutrient concentrations.

Noom was founded in 2008 by friends Artem Petakov and Saeju Jeong. The app launched in 2016. The company is headquartered in New York City.

Many critics of the app have noted that Noom would previously set moderately restricted calorie allotments for the day, typically around 1,200 calories for most users, which is neither healthy nor sustainable.

You're allowed to schedule as many Treat Days as you have in the bank and can schedule Treat Days for today or any day in the future.

Noom emphasizes choosing foods with a low calorie density, which may be an effective strategy for weight loss. One 2016 study found that Noom was effective at promoting weight loss in 78% of users. However, whether Noom will work for you depends on many factors, including your diet and activity level.

Top weight loss app Noom has settled a lawsuit for $62 million to address complaints about its billing. The suit alleged Noom misled customers into signing up for low-cost trials that led to costly, hard-to-cancel subscriptions. Noom said it will change its practices to make pricing and policies more transparent.

Users have complained about unexpected charges and poor customer service. Free trial subscription services can be helpful when trying out an app, but some customers of the popular diet app Noom, which offers a free trial period, have complained about receiving unexpected charges.