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Medical Disclaimer

Last updated: May 2026

About LivaFast

LivaFastis a privacy-first iOS and watchOS app that helps adults track intermittent fasting, lab values, and lifestyle factors relevant to non-alcoholic fatty liver disease (NAFLD), also known as metabolic dysfunction–associated steatotic liver disease (MASLD). LivaFastis designed to support — not replace — the relationship between you and your healthcare provider.

Not medical advice

The information provided by or assembled within LivaFast, including but not limited to fasting protocols, lab value displays and trends, educational content, and any prompt the App produces for use with a third-party large language model (“LLM”), is for informational and educational purposes only. It is not medical advice, not a diagnosis, and not a treatment recommendation. LivaFastdoes not establish a doctor–patient relationship. Any response generated by an LLM after you paste the prompt is produced by that third party, not by LivaFast, and is similarly not medical advice.

Always consult a qualified healthcare professional before making decisions about your diet, fasting practice, medication, supplements, exercise, or treatment plan. Never disregard medical advice, or delay seeking it, because of something you read or were shown in LivaFastor in an LLM’s response to a prompt generated by LivaFast.

Not a medical device

LivaFast is a general wellness and informational app. It has not been reviewed, cleared, or approved by the U.S. Food and Drug Administration (FDA), the European Medicines Agency (EMA), the UK Medicines and Healthcare products Regulatory Agency (MHRA), or any other regulatory authority as a medical device. LivaFast is not intended to diagnose, treat, cure, mitigate, or prevent any disease.

Interpreting values, trends, and LLM output

LivaFast does not compute clinical risk scores on your behalf. It records the data you enter and the signals it receives from HealthKit, and it can package that data into a prompt for a third-party LLM. Each of those layers has limits you should understand:

  • Lab values and trends displayed in LivaFast reflect data you or your provider have entered. LivaFastdoes not verify the accuracy of entered values and does not replace your provider’s interpretation of laboratory results.
  • FIB-4 and other derived scores are not calculated by LivaFast. If an LLM computes such a value from the prompt you paste, that calculation is performed by the third party. FIB-4 in particular is a screening aid, not a diagnostic test — only a clinician, typically in combination with imaging (e.g. FibroScan, MRE) or biopsy, can diagnose fibrosis.
  • LLM responses are generated by a third-party model based on the prompt you paste. They are probabilistic text, not clinical assessments. Models can be wrong, out of date, or miss important context about you. Treat any response as a starting point for a conversation with your healthcare provider, not as a substitute for one.

About personalised review prompts and third-party LLMs

LivaFastcan assemble a structured prompt containing your full health context — lab values, fasting history, HealthKit metrics, body composition, challenges, and trends — and copy it to your device clipboard with a single tap. The prompt is built locally. LivaFast does not call any LLM itself, and your data is not transmitted by the App.

If you paste the prompt into a third-party LLM — such as Claude, ChatGPT, Gemini, Grok, Perplexity, or any other service — you are voluntarily disclosing personal health information to that provider. That provider’s terms, privacy policy, retention rules, training policies, and jurisdiction then apply. It is your responsibility to choose an LLM you trust and believe to be secure before pasting your prompt. Do not paste the prompt into a service whose data handling you are not comfortable with.

No LLM is a physician, a registered dietitian, or a licensed clinician. An LLM cannot examine you, review your full medical history, reliably account for the medications you take, or provide personalised medical advice. Its response is general information, not a clinical opinion.

Fasting safety — who should not use LivaFast without medical supervision

Do not begin or modify a fasting practice based on LivaFast without first consulting a qualified healthcare provider if you are or have:

  • Pregnant, planning to become pregnant, or breastfeeding
  • Under 18 years of age
  • A history of an eating disorder (including anorexia nervosa, bulimia nervosa, binge eating disorder, or ARFID)
  • Type 1 diabetes, or Type 2 diabetes managed with insulin, sulfonylureas, or other medications that can cause hypoglycemia (low blood sugar)
  • Advanced liver disease, cirrhosis, hepatic decompensation, or a history of liver transplant
  • Chronic kidney disease (stage 3 or higher)
  • A diagnosed cardiovascular condition, including recent myocardial infarction (heart attack), unstable angina, or arrhythmia
  • A body mass index (BMI) below 18.5
  • Currently taking medications that require food for absorption or that affect blood glucose, blood pressure, or electrolytes
  • Any other medical condition for which prolonged caloric restriction could be unsafe

Emergencies

LivaFastis not designed for use in medical emergencies. If you are experiencing a medical emergency — including but not limited to severe abdominal pain, vomiting blood, black or tarry stools, confusion, jaundice (yellowing of the skin or eyes), chest pain, difficulty breathing, or thoughts of self-harm — call emergency services immediately: 911 in the United States, 999 in the United Kingdom, 112 in the European Union, or your local emergency number. If you are in crisis or experiencing thoughts of self-harm, contact a crisis line such as the 988 Suicide and Crisis Lifeline (United States), Samaritans at 116 123 (United Kingdom and Ireland), or your local equivalent.

Eating disorder considerations

Intermittent fasting can trigger or worsen disordered eating in vulnerable individuals. If you find yourself preoccupied with fasting windows, feeling guilt or shame about eating, restricting beyond what your provider has recommended, or using fasting to lose weight rather than to support metabolic health, please pause use of LivaFast and contact a qualified professional. In the United States, the National Alliance for Eating Disorders helpline is available at 1-866-662-1235.

International and regional notes

LivaFast is available in multiple countries. Health regulations and standards of care vary by jurisdiction. The information in LivaFast may not reflect the standard of care, drug availability, or laboratory reference ranges in your country. Always defer to a healthcare provider licensed in your jurisdiction.

Privacy reminder

LivaFastis designed to keep your health data private. All personal health data is stored on your device and synced only to your personal iCloud account via Apple’s CloudKit Private Database. LivaFast does not transmit your health data to LivaFast servers or to any third party. For full details, see our Privacy Policy.

Changes to this disclaimer

We may update this disclaimer from time to time. Material changes will be reflected by an updated “Last updated” date at the top of this page, and significant changes will be communicated within the app.

Contact

Questions about this disclaimer or about LivaFast’s medical positioning can be sent to w.frankthamel@gmail.com.

LivaFast.com