I know this is an old thread but...
Please refrain from telling people "you don't need to lose any more weight, you're too thin" after their long journey of weight loss. You don't know what they've been through, or what their goals are.
(while I'm here...how do I respond to that? Do I diet-bean dip them??)
I had exactly the same issue, while I was still about 5kg overweight. I just made non-committal noises and stopped discussing my diet around them. (Worked only because they were my coworkers, not friends or family).
Oh, goodness, yes! I've lost about 25 lbs since March - but it was mostly baby weight (gave birth way back in September!) and then a little some, putting me back at my college weight. I admit, I went into overdrive at first and worked out like crazy (5-6 days a week) to lose the initial weight to prepare to be bridesmaid in a wedding next month, and have since slowed down (2-3 days a week) to just maintain. But I'm still well within the normal BMI. And I look and feel great. My husband loves it and my own mother approves. Yet, I'm getting lectures from casual aquaintances that I've lost too much and not to lose more weight (I don't plan to, I continue to eat healthy and work out simply to maintain and tone.) It's to the point that I'm embarrassed to show up and meet people that I haven't seen in a while.
Funny thing is, my husband also has lost 25 lbs since March, he joined the healthier eating and exercise routine with me. Does he get any grief from anyone? NOOOOOOOOOOOOO