Can Keto Dieters Benefit From Knowing Their Body Mass Index? How Does BMI Impact a Keto Diet? How Does Body Fat Percentage Affect a Keto Diet? How Does Body Fat Impact a Keto Diet? How Does Body Fat Impact A Keto Diet? No matter whether you’re on a keto diet to shed excess pounds or simply curious to know more about what your BMI score represents, it is vital that you comprehend its implications on overall health. If you are overweight or obese, losing weight and maintaining it may be difficult. Therefore, before making significant dietary changes it is a good idea to seek approval from your doctor first.