Exactly. These population studies are notoriously unreliable both because of the obvious associational differences (e.g., those consuming or not consuming avocados in Finland), as well as the cherry-picking for whatever stands out in such a study by the mere chance of statistics.
There’s a little, old book called *How to Lie with Statistics* that explains all that. It’s a short read albeit a little tedious (dry) but after reading that, you’ll NEVER believe another *study shows* again in your life.
Studies show what someone wants them to show and are often designed to fail.