Measuring calorific intake and output is the difficulty though ... wearable body monitor that continuously measures the calories burned by the wearer. When uploaded to the bodybugg website ...

The site, said registered dietitian Mary Wilson, "is a real nice online way to track your food intake and your exercise output, so you can get a better handle on the calories you're expending and ...

His solution is to measure his body’s intake by eating nothing but Soylent ... cracker but it’s not actually measuring the energy output as this is just a test run. The actual measurements ...