Can I log weight from my Apple Watch?

Yes. Phaze on Apple Watch has a weight entry screen where the Digital Crown scrolls the value up or down in clean increments. Tap the field, spin the crown until you see your scale reading, tap confirm, and Phaze writes a HealthKit body mass entry on your behalf. Because the entry lands in HealthKit, every other health app on your phone, your scale's companion app, MyFitnessPal, even the doctor portal that reads HealthKit, sees the exact same number. Phaze pulls the trend back into its weight chart and overlays your GLP-1 dose cycle on top, so you can see how your weight curve responds to where you are in the dose week. No phone tap is needed at any point in the flow.