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What do the Xenomorphs in the Aliens movie eat?

We know that the alien xenomorph needs to eat something because it is a living being and one of the most important tenets of living things is that they need energy to live and grow. It is illogical to assume that the alien xenomorph will eat NOTHING and still grow well over two meters and weigh at least two hundred pounds.

In addition, the creature has armored, acid-resistant armor, as well as half a liter of hydrochloric or sulfuric acid for blood, abundant mucus-like drops capable of spinning catacombs of fluids in its body that can sprint at a speed of 20 miles per hour and has the power to break through body protection. I find it hard to believe that this can be done with a single meal of human heart, blood, liver, kidneys, and various sweetbreads.

Having never seen them eat before, we need to infer what they could consume from what is around them in order to continue to build mass, muscle, armor, and blood to become the formidable killing machines we know about that they are them. We can use the first two films for our extrapolation.


There is a single creature in Alien and all it needs to eat is the humans aboard the Nostromo and all they brought with them. Ripley has been shown to find an empty storage container while hunting the creature. So, one can assume that it took mass to grow and, in this case, could eat the food of its host creature in order to survive. This seems reasonable when the creature has taken some of its biology from the host in order to ensure at least some degree of compatibility with the organism's ecosystem and food supply.

It can also be deduced that there was more than one storage container of this type on the ship so it didn't cost much to accept human food and the people it killed during the hunt were sufficient to get the bulk that it took to grow and expand in size.

All of its advanced biochemical processes, as well as its silicon build-up, could likely be fulfilled by the engineering equipment that makes up the ship in the form of metals and other inorganic materials found in a spaceship the size and complexity of the Nostromo. Without a thorough examination of the ship, it would have been able to fill with inorganic material and it would never be noticed or overlooked by the crew.


In aliens we have almost the same conditions, a sizeable human base, lots of human food supplies, significant numbers of people to eat (and drink from, blood is a decent source of iron and fewer minerals), and refined inorganic materials in great abundance. Thus, their growth, size, and number can be assumed based on the amount of food available. We can assume that they are biologically efficient, process a greater amount of energy and convert more mass than we do. As a result, a xenomorph may not need a lot of organic material to physically develop. That is why they are so ready to leave their host when the nymph is in danger.

In summary, xenomorphs eat what their hosts eat and can likely find a source of inorganic material compatible with their biology on every planet they are on (silicon is the eighth most abundant material in the universe and the second most common mineral compound on earth). .This high level of adaptability would surely make them an alpha predator on any world where they have enough compatible inorganic material to allow them to complete their molting and grow to adult size.


The sweetbreads probably have more food than previously thought.

Thaddeus Howze ♦

It was a joke, Jim. I think both Kyle and I are aware of their true natures ... I'll admit my humor may have been too subtle.

Thaddeus Howze ♦

But there are few things that can do it in twenty-four hours. By the way, trees consume carbon dioxide and convert it into mass. So you don't get a Passport for Instant Growth Without Consumption.


Large. Now I'll lie awake at night worrying about an alien stealing my sweetroll.


Eat trees. Or at least they have a metabolism. The roots extract nutrients and water from the soil. The leaves absorb CO2 and in the chloroplasts use the energy of sunlight to convert CO2 and water into various sugars - photosynthesis and the Calvin cycle.