Are the Latest Hyped Wellness Buys Actually Worth Your Money?

What it is: By blowing into its device, Lumen claims to help users hack their metabolism. How? By telling them if their body is using fats or carbs for fuel. Based on that, it gives food recommendations.

Verdict: Pass

"The accuracy of the readings can be questionable on many occasions. If tightening up your nutritional habits is more of a priority than worrying about your metabolic rate, you're better off with an app that offers bigger meal planning libraries or more advice on the benefits of specific nutrients and how you can functionally build your own program," says Walker.