Lechem in this context probably doesn't literally refer to bread alone.
You find other places in the Torah where Lechem was not a reference to bread but rather to life-sustaining food.
For example, The Monn which certainly wasn't bread was also referred to as Lechem
וַיִּרְא֣וּ בְנֵֽי־יִשְׂרָאֵ֗ל וַיֹּ֨אמְר֜וּ אִ֤ישׁ אֶל־אָחִיו֙
מָ֣ן ה֔וּא כִּ֛י לֹ֥א ...