That’s a reasonable explanation for the spread across racial groups. But that spread has existed for a long time. There are other even more important phenomena to explain, like (1) why is it going up across all (or most) groups and (2) why are there geographic disparities?
It could also easily be the historic cultural dietary trends of that geographic region (e.g., I suspect moonshine is still predominantly consumed in Appalachia, although that is primarily due to past government policies, and cheese curds near the Great Lakes).
