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Observers of the gift will observe the iron giant approach the receiver, silently raising his hand, as a darkened blood commences to leak through the crevices of his gauntlet. The Giant will do a cross on the receiver, not really mattering its placement. The mark will feel warm, and progressively on the next few moments, the user will start feeling how hunger and thirst are no longer there, and neither is the need for air. The recipient will feel completely content and well fed. No starvation/dehydration symptoms are noticed from usual recipients.

Valentine and Darlin' have reached a level of understanding so deep that they think and feel in unison. Darlin' replaces all of Valentine's bodily needs and Valentine provides Darlin' with the critical thinking and skill to keep them both alive and prospering.
Valentine's internals have changed due to this new union,
Their blood has turned pink due to the large consumption of Big League Chew.
Darlin' has taken over Valentine's need for water, separating their cells and working with their body.
Darlin' has worked their way into Valentine's brain, not altering it but cleaning it of any unneeded chemicals and hormones that can alter their thinking and keeping their cells healthy.
Darlin' has changed Valentine's lungs, they've changed into two other hearts to allow for their blood to spread nutrients through the body at an accelerated rate.
Darlin' has figured out how to synthesize oxygen and other gases, allowing Valentine to not need to breath.

The alien symbiote residing in the Contractor feeds primarily off blood and/or spinal fluid. If this diet is not maintained, it will be forced to feed on the host, slowly killing them both, or weave itself a protective cocoon out of it's amber like secretion & entering a period of dormancy. It should be noted that the flower often fully replaces the digestive system of the Host organism at this point, requiring no other food/water & only minimal air or sleep.

During recent testing, UA-566 has demonstrated its ability to survive for long periods without oxygen. During the engagement, UA-566 was fully submerged in a tank of water with other aquatic life for a total of 48 hours. The subject did not lose consciousness for the entire testing period, not even for the purpose of sleeping. It was seen occasionally feeding on fish, though other than this predation behavior, it spent most of its time staring directly at the research directors present throughout the period. The three researchers have requested transfers out of Site-5, citing intense paranoia and fear stemming from this interaction. These emerging memetic properties are in need of further research.

Spirits do not need to breathe, eat, drink, or sleep as humans do. It’s only logical that a girl that binds herself to so many would start to take on their attributes. This power is passive and not any more obviously supernatural than Grace already is.

The Solider is accustomed to going long periods without food or water and can operate on very little sleep.

Through their faith, the priest is able to stretch bread or fish to extreme lengths, feeding a seemingly endless number of people from meager supplies.

While submerged, the aquamancer can fully sustain themselves from the waters around them, entirely forgoing food, drink, and even air. They may also enter a state of hibernation, remaining underwater and incapacitated for up to two months.