A prototype breathalyzer developed by NTT DoCoMo monitors levels of acetone and lets the user know whether their body is burning lipids.

A prototype breathalyzer developed by researchers from NTT DoCoMo research laboratories in Japan tells users whether their exercise is working and their body is burning fat. The pocket-sized sensor measures levels of acetone on the breath and could help people determine which types of exercise are effective in terms of fat loss.

Phys Org reports that the new device is capable of detecting acetone concentrations in the range of 0.2 to 50 parts-per-million. It consists of a pressure sensor to detect the exhaled breath and two types of semiconductor-based gas sensors to detect acetone. After a user blows into the device, the acetone levels can be calculated and sent to a smartphone within 10 seconds.

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