Fantastic mate, great job.
Amazing - congratulations!
Wow! You look great! Congratulations! You must feel so good
Only 25kg lost? Looks like more - great job!
Members: [insert appropriate/relevant wise saying or deep thought here]
I hope you get this message.Comments welcome.
Congrats. Looking great.
Congratulations! You have done remarkably well
The fiction is out there... but so is the truth!