Baking: does yeast need sugar?

Self-tutoring about baking: the tutor mentions a lesson he learned.

I went to make French bread the other day and discovered a recipe that calls for yeast and flour, but not sugar. (I’d been led to believe that yeast needs sugar to feed on.)

Apparently, sugar needn’t be provided as such: I made the recipe and it worked fine. It turns out that yeast can break down flour into sugar, then feed on that.

Source:

The Stay At Home Chef (YouTube)

kingarthurbaking.com