Conducted by the University of British Columbia, a peer-reviewed paper was recently published in the Obesity Journal. The randomized trial was led to explore the results of those following a ketogenic diet versus the lower-fat, higher-carbohydrate Weight Watchers protocol. The aim of the study was to compare the outcomes from participants who employed the food choices determined by a keto mobile health app (branded ‘Keyto’) versus participants who followed the Weight Watchers calorie-restricted, low-fat regimen.
First, let’s discuss what these two different diet plans entail.
The Keyto Program
Keyto’s Mediterranean-style keto program was developed by Dr. Ethan J. Weiss, Dr. Ray Wu, and Liane Nakamura. The UCSF preventative cardiologist (Weiss) along with Wu, an MD from Cornell, teamed up with Nakamura—an engineer and product developer.
Keyto is a heart-healthy, low-carb lifestyle and it includes an application which delivers personalized ketogenic nutrition plans, as well as a breath sensor.
The sensor monitors food choices with breath acetone biofeedback. In other words, no more keto strips needed since the sensor picks up acetone levels, and those levels indicate the presence of ketones. Studies show that acetone concentration (BrAce) correlates with the rate of fat loss in healthy individuals. 
Not only does the breath sensor let you know if you’re in the metabolic state of ketosis, but its instant feedback also assists with motivation for healthy ketogenic food choices.
The Weight Watchers Program