I was just being honest. I know people will disagree with what I said, but all of this discussion is nothing compared to what I hear being spoken in real life. Let's face it, people are judged all of the time on physical appearance. You may disagree with this, but it happens all the time in the business world.
If a close friend asked my advice about a diet, etc. that I thought sounded unsafe, or just nothing that would help, I would tell exactly what I thought. If I hear something like this from acquaintances or in a work situation with colleagues, I keep my mouth shut. If I am asked point blank about how I stay fit/thin/whatever, from someone I don't know that well, I laugh and say "healthy eating and riding my bike, no magic."