There is close scrutiny of the use of BMI, or Body Mass Index, as a measure of an individual's health. The tool has been used by doctors for more than 50 years to measure an individual's body fat, but a group of experts from around the globe are proposing new definitions of obesity that consider a spectrum for how excess fat may or may not impact an individual's health. There are also concerns around how the tool can prevent people from seeking appropriate mental health care for eating disorders.