A randomized trial found that a ketogenic diet app with breath acetone biofeedback produced greater weight loss than a calorie-restricted low-fat diet app over 12 and 24 weeks in adults with overweight or obesity. The evidence supports breath acetone as a useful metabolic biomarker and suggests that biofeedback may help with adherence and weight-loss monitoring. This does not establish disease treatment, and results are specific to a structured diet program, not the device alone.

Keyto offers a personalized weight loss program that focuses on a low-carb, high-fat diet. The program is designed to help users lose weight effectively without experiencing hunger. It includes a 16-week course that provides a personalized lesson plan, access to a searchable food database, meal plans, recipes, and a members-only podcast. This comprehensive approach aims to educate users on core dietary principles and support them in making sustainable lifestyle changes.

A key feature of the Keyto program is the Keyto Breath Sensor, which analyzes a user's breath to determine whether they are burning fat or sugar for energy. This device helps users track their progress and ensures they are on the right path to achieving their weight loss goals. According to the company, 98% of users in their trial lost weight using the device.

Additionally, Keyto provides access to a team of experts, including a goal specialist, dietician, and personal trainer, to offer individualized support. This expert guidance, combined with the program's educational resources, aims to empower users to reach and maintain their health goals effectively.