I said it elsewhere. Basically, it combines low nutritional value with a high density pack of too-easily-digested carbs.

The effect is that it increases blood sugar and hunger, which very easily leads to higher weight. Higher weight alone is not immediately unhealthy, but it can get unhealthy pretty fast if you get heavier and heavier.

And the only objection is “well, better than sugar, so it’s not THAT bad”… But we have a lot of added sugar in bread here in the US.