I put my foot in my mouth once telling a coworker how great she looked, how much weight had she lost, etc. Come to find out she had cancer. She had lost weight due to the chemo/radiation therapy. I felt so bad but she had a good sense of humor and said it was the worst way to lose it but was a good outcome. Now I just say how good everyone looks.. they can volunteer the weight loss secret if they are so inclined! LOL Lesson learned the hard way.