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"Lots of air and even a little nutritition. Health-boosted with active mold cultures."
Deus Ex: Invisible War description

Bread is a food made through heating dough made of flour and water. Bread is one of the oldest, and most popular forms of manmade food in the world, mostly for its taste and texture. Bread only appears in Deus Ex: Invisible War as an item that slightly heals the player when consumed. Bread, along with soda, candy bars, and soy food, stacks in one inventory slot, and up to 50 similar items can be carried in this slot. Cigarettes, wine, and beer all stack in a "vice" slot and hurt the player.