As someone who gardens, I disagree. Processing the food actually removes a lot of the nutrients, not adds it. They just are able to get more colories out of what would be tossed otherwise. Ugly potatoes become instant potatoes, for example.
I think the idea is that the hydroponic farms are being built instead of conventional farming, and so you're able to produce more food per farm, and thus per farmer. And then any semi-useful food goes to food processing, meaning that you now can employ more people to generate food, similar enough to farmers to consider them the same job. Farmer here is being used as a title for generic food-production jobs.
Processing doesn't necessarily remove nutrients. It depends. It can make foods more digestible.
It can eliminate toxins and anti-nutritional factors.
It can contribute to the safety of the food.
For example, there's a big difference between grinding grains to make white (unenriched) flour for white bread and grinding grains to make whole-grain flour for whole-grain bread.
For example, the native Americans practiced Nixtamalization with corn, which improved its nutritional value and prevented, for example, pellagra in people with a diet rich in corn and lacking diversity.
There are bad and good transformations, you have to know how to separate things.
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