Unfortunately, at diagnosis, lots of new T1s drop massive amounts of weight incredibly quickly. Bearing in mind they are often slim already, this can be one of the signals to test for T1. It can be quite a precarious situation, as the sugars are usually extremely high, along with the plummeting weight. Many new T1s seem to spend a few days in hospital, hooked up to insulin drips to rescue the situation.
Much as I hate T2, I'd far rather be T2 than T1. My personal brand of diabetes feels like "Diabetes Lite". Other T2s can be much more severely affected though, so don't think I'm ignoring the seriousness of it all.