Smart scales track changes in your muscle mass, body fat percentage and other health metrics — but how do they work?

But a smart bathroom scale breaks down metrics you can use ... Things like body fat percentage and muscle mass may not be the most accurate, which is why Keatley recommends focusing on trends ...

Not all bathroom scales are as accurate as you might expect – especially body fat scales that promise to track more than just your weight. We tested smart, digital and mechanical bathroom scales from ...