How about the vitamin A from carrots? I like to drink carrot juice and also eat sweet potatoes. I'm probably getting at least 1000% of my daily value of vitamin A. I don't feel worse, but is this a bad idea? I only drink carrot juice because it is lower in sugar than other juices.
It all depends on the individual, their history, and what health challenges they might have, if any. The devil is in the details, so it's not as easy as "Is Vitamin A good or bad?" We could kill ourselves by drinking too much water. But, of course, that doesn't mean water is bad.
With Vitamin A, Grant (the author) has proposed a theory. He and others have gone on a low/no Vitamin A diet and reported benefits doing so. But, we don't know their history. Were they megadosing on Vitamin A supplements? Were they eating lots of Vitamin A fortified foods?
The Doctor interviewed in the above link, like any reasonable person, was skeptical of the claim, just based on it sounding so outlandish. But, as he drilled down into the matter, researched PubMed, and implemented/observed changes in himself and his patients, his opinion slowly changed to one of curiosity. It's an ongoing project.
So, back to your original question. If you drink carrot juice and feel fine, then I probably wouldn't change anything. If you've spent years pounding high doses of Vitamin A supplements and have any of the conditions described in Grant's free e-books or the above-linked audio interview, then perhaps reconsider. This is my opinion.
The point of the post wasn't to invoke mass hysteria about
Vitamin A. It was more of a diversion about
something that seemed interesting that may or may not be relevant or accurate. If it does turn out to be relevant to some, I imagine it will be a small number of people.