I suggest to have an Open Food Facts introduction there on top of the category… to introduce OFF, then users can naturally introduce themselves in return below
It’s a good rule, to avoid to use the forum as a chat
If you agree, you can also simply “like” the post.
Discourse default are quite well balanced to keep the forum in good health. There’s also restrictions for newcomers, like 1 picture only, 1 link, etc… this helps fighting spam.
When we moved OpenStreetMap France phpBB to Discourse, we reduced spam moderation by 99.9%