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On first launch, enter your height and weight, pick a target BMI, choose a fasting schedule, and turn on reminders if you'd like. You can change any of it later.

Popular presets from 12:12 up to OMAD (one meal a day), or set a custom number of hours. Start gentle and step up as it becomes routine.

The app fits a trend line through your recent weigh-ins and extends it to your target weight to estimate when you'll arrive. It needs a couple of weeks of weigh-ins to appear, and it flags a pace faster than about two pounds a week.

On the Today screen, open the Accountability buddy card, enter your name, and tap Invite a buddy. Your friend accepts the invite in Messages. You'll each see the other's weight lost and streak. Only a small summary is shared, never your full history, and you can stop at any time.

On the Today screen, tap Connect Apple Health on the Steps card and allow step access. Steps are read from Apple Health, which combines Apple Watch and iPhone. You can change access anytime in the Health app.

Yes, through your own private iCloud when you're signed in. It stays private to you; we can't see it.

Delete individual entries in the app, or delete the app to remove its on-device data. To remove synced data, go to Settings → your name → iCloud → Manage Account Storage → BMI Pathway. Removing a buddy stops sharing your summary with them.

No. It's for information and education only and is not a substitute for professional medical advice. Fasting is not right for everyone. If you are pregnant or breastfeeding, under 18, have diabetes or a history of disordered eating, or take medication that affects blood sugar, talk to a clinician before fasting.