Yes, I see three responses along these lines, already. Some people don't lose weight. Some people's appetite isn't affected. Some people retain their taste for sweets. And so on.

But "a bit dangerous"? Really?

Readers can find a nice summary of metformin's typical effects on Wikipedia, here: https://en.m.wikipedia.org/wiki/Metformin

YMMV: "your mileage may vary"