Meet Body+ from Withings: a WiFi scale that helps you better understand the changes your body goes through as you exercise and try a new diet. This WiFi scale monitors your full body composition, including BMI, total body fat, water %, muscle / bone mass, and weight. It can track up to 8 users.
The scale automatically syncs data to the Health Mate app. You will be able to review your history to see what is working for your body. Health Mate plays with many other health and fitness apps, which is a big plus. Body+ has a pregnancy tracker and Baby mode too.