Built for people with fatty liver — and no one else.
Most fasting apps are built for weight loss. LivaFast is built for liver health. It gathers the exact signals a hepatologist would care about, and hands you a one-tap prompt you can paste into whichever LLM you already trust.
Why a dedicated app matters
Fatty liver disease affects 38% of adults globally, yet there isn’t a single mainstream health app designed for it. Generic fasting trackers don’t understand ALT trends. Nutrition apps don’t know what FIB-4 means. Fitness platforms don’t account for the specific metabolic profile of MASLD.
LivaFastwas designed from day one around the biology of fatty liver disease. The fasting protocols are calibrated for hepatic fat mobilization. The lab tracking follows the exact biomarkers your hepatologist checks. The challenges and Apple Watch integration cover the lifestyle inputs that actually move liver markers — not generic wellness advice.
This focus means saying no to a lot. No calorie counting. No macro tracking. No social features or gamification. Just the tools that matter for reversing fatty liver, presented calmly and honestly.
One prompt. Your whole liver story.
LivaFastdeliberately doesn’t hand you a single made-up score or a FIB-4 verdict. The app has every value it would need to compute one — but reducing your health to a number we invented isn’t something we’re willing to do. Instead, it bundles your full context into a structured prompt that any modern LLM can read and reason about.
The prompt is built from:
- Every lab value you’ve entered, with the date drawn
- Every fasting session you’ve completed
- Your fasting compliance rate over time
- The challenges you’ve taken on
- HealthKit data: Apple Watch activity, exercise, sleep, and body metrics
- How each of those signals has trended across months
One tap copies the whole package to your clipboard. Within a second you can paste it into Claude, ChatGPT, Gemini, Grok — whichever model you find safe and capable — and get a personalised review that’s actually grounded in your numbers and your trend, not a generic answer.
What you skip: hunting through old PDFs, typing lab values one at a time, re-listing your body metrics, summarising your last three months of fasting. The frontier model gets the full story in one paste, so the review comes back sharper and more specific than anything a small on-device model could produce from the same data.
Private by design, not by policy
Your health data never leaves your device. LivaFast uses Apple CloudKit Private Database for sync — we literally cannot access your information.
There are no analytics SDKs. No crash reporters that see health data. No third-party services with access to your labs, your fasting windows, or your HealthKit metrics. The app doesn’t even have a login screen — your Apple ID handles authentication silently via CloudKit.
The prompt is only assembled on your device, only when you ask for it, and only ever lands in the LLM you choose to paste it into. LivaFastnever calls a model itself — we have nothing to send and nowhere to send it.
You pick the model. You keep the control.
Models change every few months. Privacy policies change. Your trust in a particular provider may change too. LivaFast stays out of that decision entirely: the app produces the prompt, you choose where it goes.
Paste it into Claude for a careful, cautious read. Into ChatGPT or Gemini for a second opinion. Into a local model on your own machine if that’s your bar for privacy. Because the prompt already contains your lab trends, fasting history, and HealthKit signals, every model is working from the same complete picture of you — not a thin slice.
That’s the trade we picked: instead of locking you to one model we shipped on-device, we give you the data, the prompt, and the freedom to ask the best model available today — and the best one available next year.