On Sun, 3 May 2020 22:55:59 +0000 (UTC), Phil Pugliese wrote:

>In the TU it all probably would be grown & raised "down there" somewhere,
>underneath everything else.Just like it would on an O'Neill/L5 Society
>space habitat.

And more-or-less like was done for at least some of Trantor's food in the
extended Foundation series.

There are several ideas that address this need, for both space habs and
trantors - Twilight Sector's "gloop", "CHON-food" from the Heechee novels,
"protocarb" (don't remember where I read this one), hydroponics,
carniculture (both used in a lot of SF), and I'm sure that the Collective
Memory of the TML can come up with others, and even invent a few.

There are issues, however, with such "high-density" foods: The human body
does need a certain amount of indigestible bulk for proper function, and
it's entirely likely that there's a limit to nutritional density under any
circumstances - the protein and vitamin molecules that the body can't
manufacture on its own will have a certain size, and the 'correct' amount
will thus have a certain minimum bulk.

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