From John Cook we have this bit of humor that also has the feel of truth:
— John D. Cook (@JohnDCook) August 5, 2016
I'm old enough that I can remember at least 3 cycles of
- Coffee is good for you and prevents heart disease and other ailments.
- Coffee causes heart disease and cancer.
Basically, I've stopped listening. For years butter was really really bad and you should eat margarine if you must have a butter-like spread. Now, it's margarine that's bad and butter is all right after all.
The best medical advice is eat what you like: sooner or later someone will publish a study showing it's good for you.