it's not turmeric, it's curcumin, which is about 2% of turmeric by mass (so, you'd need to eat ~4.5g turmeric daily to match study doses)
Typical Indian cooking uses turmeric in pretty much everything. I wouldn't be surprised if daily consumption of turmeric is very close to the figures you mentioned.
Typical Indian cooking uses turmeric in pretty much everything. I wouldn't be surprised if daily consumption of turmeric is very close to the figures you mentioned.