It's 3 carrots a day and the skin color is harmless (other than not actually protecting against UV but that's, like, not worse than not doing it) so it's actually quite positive. As long as they don't think they can suddenly skip sunscreen, ...
I actually had this happen to me as a little kid. I had to go to the hospital because they needed to check if I was jaundiced. Turned out it was just that my favorite foods are carrots and squash. Eating more vegetables isn't a bad thing.
Eating too much of anything is bad for you. Carrots are only a problem if someone is trying to diet and allows themselves infinite vegetables because vegetables are healthy though. Which is a silly thing to do.