Looking at the ingredients list on Wonderbread white bread, could you make that at home?

You can make bread with salt, flour, yeast, and water. Most breads in the grocery store, however, have considerably more ingredients, which are more in the purpose of treating the foodstuff as an industrial product rather than for nutritional purposes.

(That's not automatically bad btw. The amount of ultraprocessed food you can eat is actually probably quite a lot in relative terms before it starts causing health problems --- the problem is when it becomes 70-80% of your diet.)