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Noom has become ubiquitous in the diet space. But do their claims stand up to scrutiny?

I originally wrote about them in 2020. One of the first things I noticed was that their commercials are chock full of diet advice that is as old as the hills and has no research to back it as actually creating sustained weight loss. (“Eat grapes instead of raisins, drink wine instead of beer, drink a glass of water if you’re hungry, blah blah blah) a lot of the marketing seems to be based on the old “eat watery, high fiber, bulky food so you’ll feel fuller” advice that doesn’t work because your body is a more sophisticated machine than, say a lawnmower. 1987 called, and they want their crappy diet advice back.

The very first thing I noticed though, was that they were claiming to be a brand new way to lose weight while also claiming that they can help you keep weight off for good. These two statements are mutually exclusive. Either you are brand new, or you have data proving long-term efficacy. It can’t be both.

Remember that almost any diet can show short-term weight loss, but about a century of data shows that almost everyone regains their weight within five years, so short-term results mean, essentially, nothing. Given that, let’s examine Noom’s claims.

Their original claim of “weight loss for life” was based on a study showing that 78% of users in 2016 had “sustained” weight loss… over 9 months.

It should be noted that the graph that accompanies the claim only shows 4 months, making me think that people started to regain at the four-month mark and that they are borrowing from Weight Watchers trick of saying “participants regained weight but remained below their starting weight” in order to call this “sustained” weight loss. Of course, the graph they created also doesn’t have any information about how much weight was lost, which does not engender confidence. The graph shows Noom comparing favorably to something they are calling “restrictive diet” but they don’t offer any information as to what that would be.

I looked up the actual study and found that what the study (Successful weight reduction and maintenance by using a smartphone application in those with overw*ight and ob*sity) actually says is that “77.9% reported a decrease in body weight while they were using the app (median 267 days; interquartile range = 182).” I’m not sure that “decrease in body weight” is the same thing as “sustained weight loss” but, regardless, we’re still only talking about nine months.

I would imagine the reason they are still touting less than 80% of people managing to lose weight for 9 months in 2016 (rather than, say having followed people until now,) is that almost all of those people are having the exact same experience of almost every other dieter – losing weight in the first year, and then gaining it back in years 2-5.

But, again, I wrote about that two years ago, surely they have longer-term follow-up now. Right?

Not so much.

One of the “longest” studies they cite (Self-Reported Nutritional Factors Are Associated with Weight Loss at 18 Months in a Self-Managed Commercial Program with Food Categorization System: Observational Study) looks at outcomes at 4 and 18 months. There are many issues with the study design and methods that are beyond the scope of this article, but the participant numbers are pretty