There have been so many “breakthroughs” from eating beets to this new mushroom coffee for all kinds of miracle remedies. Is there any benefit at all and why can’t you make it your self by pulverizing dried mushrooms of the same variety they use into powder and making the coffee yourself?
Most plants and really most foods in general have some sort of effect other than calories, at least for individuals that may not have a fully complete diet.
Additionally there are more and more studies about phytochemicals, which appear to have a lot of potentially healthful properties.
Humans are hard to rest though so basically, just eat healthy. Eat a lot of plants and reduce animal products (maybe, this is a contentious recommendation) and mostly just don’t eat processed food if you can.
Even white rice and white potatoes are “healthy” in the right quantities and ratios.
Not really want you asked, but if you are curious “eating on the wild side” by Joe Robinson is a great book that talks about phytochemicals and how to pick vegetables that might be more “healthy”.