No. I don't share it during the dating stage. But I don't hide my eating habits, and I freely admit my interest in my health. All in vague terms, of course. No one actually wants to hear that much about it in RL.
I barely talk about my weight loss with people I trust and have known for years and years, let alone a person I just started dating.
So, I guess don't go to lengths to hide it, but it doesn't need to be brought up. I also wouldn't compromise your eating/exercise either.
Congrats on your success so far! You've worked hard!