I remember when it first started my cube mate who I was pretty decent friends with said "There is something different about you, not sure what it is but something has changed." Some people wondered if I was sick. I tried to hide it as best I could by saying it was a better diet and losing weight, which was true as well.
It's an exciting time though when you first notice other people taking notice. However before I just couldn't hide it anymore and had to go full time it got a little annoying because I was getting stared at pretty hard by a lot of people.