A free app for Android, by Lumen.me.

Lumen is a revolutionary device that provides a quick and easy way to track your metabolism and nutrition in real-time.

Why?

Your metabolism is a leading indicator of health, energy, and longevity. We know that more than 80% of the calories you consume are stored as fat. But that’s not all — in addition to fat, we also burn muscle and connective tissue when we eat.

 If you’re eating a healthy, balanced meal, you should be using this tool to help you get a complete picture of your daily intake.