KETHOS
Extended Fasting, Done Right
About
This app guides users through extended fasting periods, offering a detailed timeline of bodily changes and educational content. It supports custom fasts up to 10 days and provides structured refeeding advice to ensure safe and effective fasting.
What's New in KETHOS
1.1.3
May 8, 2026
updated logo
Developer apps
FAQ
What is KETHOS?
KETHOS is a health and fitness application designed to guide users through extended fasting periods. It provides a detailed timeline of bodily changes during a fast, educational content, and structured refeeding advice.
What are the benefits of using KETHOS?
KETHOS helps users understand their body's response to fasting, from glycogen depletion to stem cell activation. It supports goals like fat loss, autophagy, immune reset, and longevity by providing research-backed guidance.
Can KETHOS be used for short fasts?
While KETHOS is built for extended fasts (24 hours to 10 days), it also supports daily 16:8 fasting for metabolic health. Users can choose custom fast durations or select presets based on their goals.
How does KETHOS educate users?
KETHOS includes a built-in educational library covering topics such as autophagy, electrolytes, ketosis, refeeding syndrome, and sleep changes during fasting. This helps users understand the science behind their fasting journey.
Does KETHOS track user progress?
Yes, KETHOS tracks fasting streaks, completion history, and provides shareable summary cards for milestone fasts. It also offers phase milestone notifications to keep users informed of their progress.
What devices does KETHOS support?
KETHOS is available on iPhone and iPad, making it accessible to a wide range of Apple users interested in health and fitness tracking.
Is KETHOS suitable for all users?
Extended fasting is not appropriate for everyone. KETHOS advises users to consult a qualified healthcare provider before beginning any fasting protocol, especially fasts longer than 24 hours, or if they have specific health conditions.
How often is KETHOS updated?
The latest version of KETHOS is 1.1.3, and it was last updated on May 8, 2026. This indicates a commitment to ongoing development and improvements.