I have lots of nutritional scientists as close friends. they're aware of this problem. they also majorly disagree.
According to nutritional science, there are no unhealthy foods. That is oxymoronic. A food, by definition, is something edible which prodives you with some kind of nutrients, right? A poison is not a food, neither is a rock.
There is, however, an unhealthy diet. Honestly, I wouldn't give two hoots about "studies" coming out, and definitely look at their funding first and foremost.
Fact is, most nutritionists aren't really obsessed with what is "healthy" or not, because that is not a helpful goal in science. "Healthiness" is hard to define and almost impossible to test for unless you invest millions into year long double blind studies. It's not their major concern.
As long as you eat a balanced diet of vegetables, fruits, starches, meat, fish and dairy you are absolutely going to be okay. Any honest nutritionist will tell you that.
I think it's honestly mostly journalists, instagram models and nutritionists (these people are usually NOT nutritional scientists) who're going crazy about which foods are healthy and which are not