About FatFlow
FatFlow was created to make one overlooked idea visible: when you eat matters, not only what you eat.
It helps you see the estimated shift from processing food to using more stored energy, so you can understand how meal timing shapes your day.
FatFlow is free, private and educational. There is no calorie counting, no prescribed diet, no ads and no subscriptions. Your personal logs stay on your device.
Why FatFlow Matters
After eating, insulin rises to help the body use and store incoming energy, while reducing the release of stored fat. As time passes without more calories, insulin generally falls and the body becomes more able to use stored energy.
Seeing this pattern can make frequent eating, late meals and mindless snacking easier to recognize. Over time, healthier meal timing patterns may support weight management, reductions in visceral fat, improved insulin sensitivity and other markers of metabolic health.
Results vary between people. FatFlow helps build awareness, not guarantee outcomes.
The Story Behind It
Most health advice focuses on what you eat. But when faced with insulin resistance, prediabetes and fatty liver, I discovered that when you eat can be as important.
Understanding how meal timing and insulin affect the body's access to stored body fat for energy was a game changer. That awareness helped me make changes that supported weight loss and meaningful improvements in my health.
FatFlow was born from personal necessity. It was created to make this invisible process easier to understand and shared freely in the hope that it may help others.
How FatFlow Works
Log a meal, drink or activity. FatFlow estimates your current state, the time until the next state and how long you have spent in fat burning.
Your timeline helps you compare days and see how meal timing, drinks, activity and recurring habits shape your pattern.
These are educational estimates, not direct biological measurements.
Understand Your Patterns With AI
Meal timing and activity patterns can be difficult to recognize while living through them day by day.
FatFlow prepares your recent meal timing and activity history together with minimal guidance so AI can provide more consistent insights. You can paste the copied data into ChatGPT, Gemini or another AI assistant.
You can ask the AI chat to identify:
- Frequent eating or snacking patterns
- Late meals or drinks that extend food-processing time
- Longer gaps between meals
- Recurring daily or weekly routines
- Differences between weekdays and weekends
The more days and accurate logs you provide, the more helpful the insights may be. AI output can be incomplete or wrong and should not replace professional medical advice.
The Science Behind It
After eating, insulin helps the body use and store incoming energy and reduces the release of stored fat. As time passes without additional calories, insulin generally falls and the body becomes more able to access stored energy.
This transition is gradual, not an on-off switch. FatFlow simplifies it into three states so the pattern is easier to understand. In FatFlow, fat burning means an estimated period of greater reliance on stored energy, not that the body is using fat exclusively.
Important Limitations
FatFlow provides educational estimates, not direct measurements. It does not measure insulin, blood glucose, metabolism or fat burning. Actual responses vary based on meal size and composition, activity, metabolism, sleep, medications and health conditions.
FatFlow is not a medical device and does not provide medical advice, diagnosis or treatment.
Privacy and Purpose
FatFlow is designed as a free public-benefit educational app.
- No account required
- No advertising
- No subscriptions
- No sale of personal data
- Personal logs remain on the device
- Backups are controlled by the user
- AI analysis is optional and user initiated
- Health connections are optional
- Nothing from a connected health service is logged without confirmation
FatFlow exists to help people understand something important about their bodies that is normally invisible.
It is free because access to useful understanding should not depend on the ability to pay.
Sources
- National Institute of Diabetes and Digestive and Kidney Diseases. What Is Diabetes?
- Harvard T.H. Chan School of Public Health. Carbohydrates and Blood Sugar.
- Wilkinson MJ, Manoogian ENC, Zadourian A, et al. Ten-Hour Time-Restricted Eating Reduces Weight, Blood Pressure, and Atherogenic Lipids in Patients with Metabolic Syndrome. Cell Metabolism. 2020.
- Lowe DA, Wu N, Rohdin-Bibby L, et al. Effects of Time-Restricted Eating on Weight Loss and Other Metabolic Parameters in Women and Men With Overweight and Obesity. JAMA Internal Medicine. 2020.