Sounds like your body has adjusted to the Intermittent fasting. All kinds of things could be going on. Could be you've accustomed your body enough to it that your stomach isnt producing as much Ghrelin. So you aren't as hungry as often. (One of the benefits of intermittent fasting)
Maybe your stomach has shrunk a little so it's not wanting as much food. Could be your metabolism has slowed down and with it your hunger.
I would be shocked if it was "unhealthy" to continue. If you don't like it try coming off the intermittent fasting and take a 2 or 3 day refeed day and eat a few thousand calories a day but spaced out over 5 or 6 meals and see how your body reacts.
With all things.. if you're concerned that it may medically be a problem discuss it with your physician. No one here can accurately diagnose you on a message board.
That said, I'd change things up first and see how my body reacted. If you're 20% body fat it might be a blessing and you might just wanna roll with it and take advantage of it until you hit 12-14% then reevaluate.