Anyway, since telling any casual acquaintance of mine that they are beautiful in person seems uncharacteristically forward of me, I decided to do the next best thing and write a blog post about it. So, you are beautiful!
How do I know? Well, for starters I am of the opinion that most other people are good looking, yes, that includes you guys, I wouldn't call you attractive, but rather aesthetically pleasing. Secondly, I find that my appreciation of a person's appearance is correlated with how interesting I consider them as a person. Since you are still reading this post, I am inclined to think you find abstract thought and identity issues interesting, therefore you probably are an interesting person. Ergo, you are beautiful!
Body image is a tricky thing. Last summer I made some modest lifestyle changes for health reasons that, as an incidental side effect, caused me to lose some weight. When this happened I began to hope that, should I lose enough weight, I might gain some self confidence. However, the rational part of my mind soon pointed out that I have always considered myself the "fat kid," and no matter what I look like, as long as I am the "fat kid" in my mind, my personality is unlikely to be altered significantly.
We, especially women, are exposed to unrealistic and unhealthy standards of appearance in our culture. I think it is important that we support each other in attempting to achieve health, not some unimportant number like weight or waistline. As a professional mathematician, I will let you know that there are a lot of very important numbers, your weight is not among them.