For your safety, there are some BMI requirements that need to be met before undergoing plastic surgery. BMI stands for body mass index. It provides a ratio that places weight into a context against height to better assess how much body fat an individual has. It’s essential to understand that popular surgeries that tighten and tone the body, such as liposuction, tummy tuck, or thigh lift, are not for weight loss. In fact, patients should be close to or at their goal weight before undergoing these