How do I track bodyfat?

A Withings scale syncs weight and bodyfat automatically. Any other scale works by logging the numbers by hand, or through Apple Health if it writes there. The guide below covers how to measure it well and what to expect week to week.

Which matters more, weight or bodyfat?

Bodyfat. Scale weight also changes with water, salt and carbohydrate, so the app shows your weight trend across days. Losing fat while keeping muscle is the goal, and bodyfat percent is the number that shows it.

What does the coach do for weight loss?

Your coach helps you plan protein and calorie targets using your food, activity and weight trend. Choose a weekly focus and adjust as you go. When the trend stalls, it says why: sleep, weekends, portions or training usually explain it.