It seems that there is always a current “what we thought was good for you, isn't”. Something that was considered healthy and even recommended, suddenly falls out of favor.

Low dose aspirin. Take one a day. Now, not so good for you. Don't take low dose aspirin. Talk to your doctor.

Coffee. Doesn't count toward your necessary daily fluid consumption. Now it does.

Caffeine? --- I’m not sure what the latest is.

Chocolate? Good for you, but stay away from milk chocolate. Or did I hear that even milk chocolate is good for you?

...and every one of these claims is backed by the “latest scientific research”.

Now that's certainly reassuring!