What I mean is you may need to have a broader group in order to draw actual conclusions.

Medical research has been heavily damaged by not including enough diversity in the sample groups. One region of India is not necessarily proof of anything other than that particular group of people does not suffer any ill-effects.

For example, millions of Europeans have been consuming dairy products for generations and suffer no ill-effects but this is only because they have a mutation that allows them to process lactose in adulthood.