the.com/nutrient

The invisible payroll your cells live on, paid in molecules instead of money.

means A substance—like a protein, vitamin, or mineral—that a living thing needs to take in for energy, growth, and staying alive.

from From the Latin verb 'nutrire,' meaning to nourish or suckle—the same root that feeds 'nourish,' 'nurse,' and 'nurture.' 'Nutrient' is the present-participle form, 'nutriens,' literally 'nourishing,' and entered English as a scientific term for the things that do the nourishing. The original image is maternal: feeding a child at the breast.

essential ones: Your body can't make about 40 of them
vitamin C: Most animals make their own; humans famously can't
hidden hunger: You can be overfed yet nutrient-starved
soil link: Depleted dirt grows less nourishing crops
micro vs macro: Some needed in grams, others in micrograms

for instance

nitrogen cycle — atmospheric nitrogen converted by bacteria into usable compounds for plants, completing earth's ~4 billion year biogeochemical cycle

phosphorus cycle — phosphate rock deposits mined globally at 250+ million tons annually for fertilizer, limiting nutrient in many ecosystems

iron supplementation in rwanda — mandatory fortification of flour and salt since 2009 to address widespread anemia affecting ~40% of children

ocean dead zones — gulf of mexico hypoxic zone expanding due to nitrogen/phosphorus runoff, covering ~6,000-7,000 square miles each summer