Well, there is, for example, flour ?
Fertiliser is called NPK, named for the main chemical ingredients, which come from factories and mines on distant continents.
This gadget is very industrial: https://upload.wikimedia.org/wikipedia/commons/thumb/3/39/Ka...
The use-by date of flour is generally a few weeks or up to three months depending on the kind of flour and the climate. Providing fresh flour all year requires a bit of technology, too. Not nearly as much as collecting N, P and K and producing fertiliser, but not zero either.
>In sunny countries such as Nigeria, South Africa, and Bangladesh, there is sufficient endogenous vitamin D due to exposure to the sun. However, [Rickets] occurs among older toddlers and children in these countries, which in these circumstances is attributed to low dietary calcium intakes due to a mainly cereal-based diet
If you treat food as simple calorie numbers, you end up with deficiencies with very bad consequences. This is just an example that I found interesting.
Obviously, we have moved very far from these basics and industrialized the whole chain, but it should be worth considering that mass adoption of vegan food requires the very same industrialization whereas true organic food will profit from a certain amount of livestock.