Aside from muscle mass, bone mass can also vary in the races.
Asian countries don't use this version of the BMI chart to measure obesity because what's considered normal for the American white person can be overweight for Asians. Instead, more progressive medicine focuses on body fat percentage, especially around the abdomen, to determine obesity and risk of diabetes and heart issues.
Another example, Tiara is considered obese in terms of BMI, but not in terms of actual health risks and body fat:
Folks should really be paying attention to those Hispanic numbers though
More black women who are considered obese look like Precious than Tiara. Black women need to get off that "thick" nonsense and embrace healthier lifestyles like eating fruits and veggies and working out regularly. It ain't healthy for you to be over 35 and still on that lazy diet.