Could Someone Please Recommend A Source For Data On Dietary Intake For Many Different Countries?

I want to analyze the prevalence of dementia across different countries (compared with the proportion of elderly for reference) and thought it would be interesting if I compared it with something dietary, just to see if there is any correlation at all that I could look into further. Where can I find datasets on specific dietary aspects for many different countries? For example: saturated fat or omega-3 fatty acid intake. Anything is good! It doesn’t have to be relating to fat specifically, though that would be cool. The most important thing I think is that it covers many different countries.