there was no control groups (veggies vs whole grains for example), they selected bunch of studies for metaanalysis with different goals and methodologies, no indications how balanced and what components where in diets in those studies.

This is exact example of junk science.

The control group is modelled from the different quintiles of consumption, so it’s false to say there’s no control group.

What differences in goals and methodologies have you identified that you believe renders them so different that they cannot be summated?

Not sure what you mean by “no indications how balanced and what components where in diets”, you’ll have to clarify.