Health
Health Disclaimer
General Disclaimer
Atomic Fast is a wellness and nutrition tracking tool, not a medical device. The information provided in this app — including fasting phase descriptions, metabolic impact estimates, readiness scores, and nutrition calculations — is for educational and informational purposes only.
This app does not provide medical advice, diagnosis, or treatment. The health information presented is based on published, peer-reviewed scientific research (cited below), but it is not a substitute for professional medical advice.
Always consult a qualified healthcare professional before starting any fasting regimen, making significant changes to your diet, or if you have any health concerns. If you are pregnant, nursing, have a medical condition, or are taking medication, seek medical advice before using this app.
How We Use Health Data
Atomic Fast accesses health data (such as heart rate variability, sleep, and activity) from Apple HealthKit or Google Health Connect with your explicit permission. This data is used solely to compute on-device readiness and wellness scores.
All health computations are performed entirely on your device. Health data is never sent to external servers, shared with third parties, or used for advertising. See our Privacy Policy for details.
Readiness Scores
The readiness score is a composite wellness indicator, not a clinical measurement. It combines signals such as HRV, resting heart rate, sleep duration, sleep quality, and activity level using published methodology. It is designed to help you understand general recovery trends — not to diagnose or treat any condition.
Nutrition Calculations
Calorie targets and macronutrient recommendations are estimated using the Mifflin-St Jeor equation — a widely accepted formula in clinical nutrition research. These are estimates only. Individual caloric needs vary based on genetics, activity level, body composition, and other factors not captured by any formula.
Metabolic Impact Estimates
The "metabolic impact" score estimates how long a meal may take your body to return to a fasting metabolic state. This is based on general principles of postprandial metabolism and glycemic load research. It is a simplified educational estimate, not a clinical measurement of blood glucose or metabolic rate.
Scientific References
All health-related information in Atomic Fast is grounded in the following peer-reviewed research.
Fasting & Metabolism
- Flipping the Metabolic Switch: Understanding and Applying the Health Benefits of Fasting
Obesity (2018)
- Short-term fasting induces profound neuronal autophagy
Autophagy (2010)
- Impact of intermittent fasting on health and disease processes
Ageing Research Reviews (2017)
- Fasting enhances growth hormone secretion and amplifies the complex rhythms of growth hormone secretion in man
Journal of Clinical Investigation (1988)
- Prolonged Fasting Reduces IGF-1/PKA to Promote Hematopoietic-Stem-Cell-Based Regeneration and Reverse Immunosuppression
Cell Stem Cell (2014)
- Intermittent metabolic switching, neuroplasticity and brain health
Nature Reviews Neuroscience (2018)
- Caloric Restriction, SIRT1 and Longevity
Trends in Endocrinology & Metabolism (2009)
Metabolic Impact
- Metabolic flexibility and insulin resistance
American Journal of Physiology-Endocrinology and Metabolism (2008)
- Metabolic effects of the dietary fiber glucomannan and dietary carbohydrate
New England Journal of Medicine (1978)
Recovery & Readiness
- An Overview of Heart Rate Variability Metrics and Norms
Frontiers in Public Health (2017)
- National Sleep Foundation's sleep quality recommendations: first report
Sleep Health (2017)
Nutrition Calculations
- A new predictive equation for resting energy expenditure in healthy individuals
American Journal of Clinical Nutrition (1990)
Questions?
If you have questions about the health information presented in this app, please contact us at support@atomicfast.com.