-text c-gray-1" >The low-carb, high-fat ketogenic diet has become increasingly popular in recent years. Keyto is looking to capitalize on the dietary trend by launching a smart breath analyzer and accompanying mobile app that the company claims can determine how efficiently your body is burning fat and provide tips on how to improve and adhere to the lifestyle. The device is available for $99 on Indiegogo.

To understand how the Keyto system works, it's important to first understand the concept behind the ketogenic diet. Followers of the dietary plan eat primarily fats and protein, while significantly reducing their intake of carbohydrates. The result is ketosis, a state in which the body starts to burn stored fats for fuel and produces ketones, which are a byproduct of the process.

According to Keyto, its sensor measures the acetones -- a byproduct of that byproduct -- in your breath to determine your level of ketosis. There aren't a ton of studies about measuring acetones orally