What are they eating?

[Nope]

Huge Hive cities everywhere but where are the rural worlds?? The Billiards in the galaxy.
What are the space marines eating?? Tube food, can food, orks?
How orks taste like??
ANSWER ME !!!

[Galroche]

Ork are born from spore so they might taste like mushroom ?
also the imperium does have agricultural world

[John Cena]

they eat soy because it makes them masculine and strong

[FieserMoep]

Space Marines can eat wood. Basically anything that has some semblance of nutrients is okay for them. Its a huge aspect of their physiology to basically burn everything that is not outright lethal to them.

[Ex-D204]

Ork taste like edible shrooms, also if you eat alot of it, you can see sanguinius

[EmperorVolo]

Originally posted by Nope:

Huge Hive cities everywhere but where are the rural worlds?? The Billiards in the galaxy.
What are the space marines eating?? Tube food, can food, orks?
How orks taste like??
ANSWER ME !!!

They can eat and digest anything. They really don't need to eat for weeks if they don't want to.

[zenebatos1]

Let me introduce you to "Corpse-Starch"

AS the name implies...its a "Mystery meat" in canned form

Think like tuna cans...made out of Corpses...

HIve-Cities denizens litteraly living the "Soylent green" life...

While Agri-worlds do exist, only the upperclass citizens actually get to taste real food

If you're a poor guy living in the bowels of a Hive city that is run by Gangs and Cults, most likely you'll either life off corpse starch rations or hint for any kind of vermin that lurks in the dark...

[EvilAsh110[ATC!]]

Corpse-starch. They are agri-worlds though. You should read some of the lore.

[Izlude]

Originally posted by Nope:

Huge Hive cities everywhere but where are the rural worlds?? The Billiards in the galaxy.
What are the space marines eating?? Tube food, can food, orks?
How orks taste like??
ANSWER ME !!!

Most likely they are eating corpse-starch. As for Orks, well they are a fungus but seem kinda meaty so my assumption is the texture would be like beef but the taste would be like a mushroom.

[ProjectPenguin]

Dont forget about the fact thats Space Marines can gain simple memorys from Flesh or blood or nearly any boodily Fluid through an organ called The Omophagea. the Blood Angels have a more powerful Version or are more profficient using that Organ. They also based some Space Marine Cult like chapters around that, Blood Drinkers and Flesh Eaters for example.
But basicly they can eat nearly everything.
The Imperium has Meat and Grains from different worlds but most of them cant afford it and eat Stuff called Corpse Starch and yeah it is what it sounds like.
you live in a hive as one tiny bit in the Imperium and you serve even after death ....litteraly.

[Vigilante]

Space marines are zombies they have organs designed to eat brains

[Naamtar]

TL;DR Their poop, they eat their own poop.

Growing space marine eats specially prepared high-proteine, high-fat, high-calcium, high-iron nutrient paste tailored to provide maximum building materiel for their growth. Fully initiated marines eat high-hydrocarbon paste that have as much calories crammed into it as transhumanly possible. It's said to be so sweet, normal humans can't eat it without vomiting out their stomachs. The backpack of a power armour have a chemical reactor that can produce the latter, using space marine's ♥♥♥♥ for materiel and his solar converter reactor for energy to convert that ♥♥♥♥ into pretty much concentrated sugar paste.

Outside of missions marines can enjoy more normal meals fopr recreational needs, but they still have to eat superfuel-food from time to time because their bodies burn thorough calories at alarming rate just by existing.

When stranded and cut from supplies, marines can eat ANYTHING as long as it have organics in it. One chapter lost it's scouts on a volcanic world and they survived by drinking mineral oil and eating volcanic asphalt, and Raptors chapter survived on a deathworld by hunting and eating dinosaurs for like 50 years.

[Adept of Machine God]

Space Marines feed on pathos.

Jokes aside, Space Marines can actually feed on Tyranids (but they don't for obvious reasons), their digestive system can digest steel, so... So they eat what they have. And I'm sure it's not something anyone would want to try.

Speaking of agrarian worlds... They exist. There are a lot of them, but they often end up out of sight - simply because it's not interesting. They produce food for themselves and for the entire Imperium. On the other hand, hive worlds can also produce food, being (SUDDENLY!) food exporters. How about a nutritious paste made from the larvae of underhive flies? If not, you can always try the classic Imperial worker's dish - a corpse bar. Are you a vegetarian? Well, that's your problem. But maybe that slime that grows on the columns that hold the hive is a plant. It might not even be poisonous.

[Adept of Machine God]

A little about orcs.
It's a popular joke that you can make mushroom soup out of orcs. But in reality, orcs are not just mushrooms, but a symbiosis of mushroom, plant and animal cells that form a single organism.
The taste... Well, I don't think it's worth generalizing to "the taste of mushrooms." Rather, the taste and texture are such that you're unlikely to want to eat it. Not to mention the biological danger of such a dinner.

[Voodoo]

For most part kadaka could feed itself still, there are enough greenery to support arable land.

As for hive cities, they get shipments from off world and recycle bodies to supplement it. Dead bodies are recycled into corpse starch and if shipment is late by a month(and it takes a ship a month to arrive from jump point to planet) then people start starving.

[Adept of Machine God]

As far as I understand, Kadaku is a death world (unless the Tyranids have already replaced most of the flora) with Mechanicus research stations.
Mechanicus... Rely heavily on imported food, since they didn't come here to play Stardew Valley. Especially on a planet where you can easily get eaten even without the Tyranids.