BMI is a device, full form of which is Body Mass Index. It returns highly reliable results.for various checks conducted by d machine. There is a already built in Normal values 4 each test. Obese, high deposit of fat,(not converted into energy , b'cos of remaining Idol, lack of walking, Lack of work-out, improper eating habits, unhygenic life style. junk food & beverage consumption beyond limits). will return values which r far higher than normal. One's health is put 2 gr8 risk, if remedial action for setting right D values in it's proper place. Also lack of intake of pure water (4-5 ltrs) daily may cause serious health problems.