On-line monitoring human breath acetone during exercise and diet by proton transfer reaction mass spectrometry

Obesity is one of the main causes to chronic diseases [1–3], such as cardiovascular disease [4], cerebrovascular disease [5] and diabetes [6] – among others. So, the obesity has become one of the main medical problems [7]. The portion of obese adult rises from 28.8 to 36.9% in men, and from 29.8 to 38.0% in women between 1980 and 2013 worldwide [8]. This rise of obesity calls for scientific ways of weight reduction. At present, exercise and diet are two commonly chosen ways [9]. However, there is obvious irrationality in the scheme design of exercise and diet due to individual...