I think those kinds of blanket statements about metformin are a little misleading and a bit dangerous. For instance I myself have been on metformin now for almost 2 years and I can assure you I have no repulsion to sugar.
But "misleading and a bit dangerous"? Really?
Readers can find a summary of metformin's typical effects on Wikipedia, here: https://en.m.wikipedia.org/wiki/Metformin
YMMV: "your mileage may vary"