I've had it said to me before, specifically about health, one week wine/eggs/milk/axle grease is good for you, next week it's not.
Those kinds of statements are generally found in women's magazines at the supermarket, not scientific journals.
Some journalist cherry-picks a quote from a medical study without understanding the context or how to frame it and then it gets repeated by your ordinary, average yahoo that also doesn't know how to interpret it in any kind of context.
The goal of every one of us should be to be scientifically literate.