this is completely retarded.
bmi is not a racialized concept, but poverty is. the reason these numbers are different across these ethnic groups is a reflection of systemic racism, not a question of biology.
so, i would support programs to help poor people eat better diets, regardless of their ethnicity.
but, i don't think it's worthwhile to waste time and research dollars on determining whether bmi is different for different racial types; it's a laughable suggestion, frankly.
https://www.bbc.co.uk/bbcthree/article/49f398eb-5546-4d68-8d07-4b74e35b1df8