Some real beautiful data graphs in this paper
Source: https://doi.org/10.1016/S0140-6736(24)02317-1
The Top 4 Countries by rate:
- India 26%
- China 18%
- USA 5%
- Pakistan 4%
This is only accounting for tracked diabetes, so some of the areas might have larger numbers.
It could also have something to do with white rice, if consumption in India exceeds that in otherwise similar countries.
By the way, the WHO states that only 77 million adults in India have Type 2 Diabetes, but maybe that's due to them using a different method.