nutrition

Latin 'nutrire' meant to suckle or nurse, describing the care given to a newborn before it could feed itself. Roman writers used 'nutritio' for the physiological act of nourishing body tissue. Galen of Pergamon, writing in the 2nd century CE, applied the term to describe how blood sustains muscle and organ. The agent noun 'nutrix,' meaning wet-nurse, came from the same root, keeping the word close to its maternal origin.

Medieval physicians brought 'nutritio' into European vernaculars through Latin commentaries on Avicenna's Canon of Medicine. English borrowed 'nutricion' in the 15th century, meaning the process of sustaining a body through food. Thomas Elyot used a close variant in his 1539 health guide, describing how eating and rest together maintain life. The idea that food contains distinct measurable substances did not arrive until the chemical revolution of the 18th century.

Antoine Lavoisier's experiments with combustion and respiration in the 1780s gave the word its modern scientific shape. He demonstrated that digestion and breathing both involve oxidation, connecting the old Latin term to the new chemistry of elements. Justus von Liebig, in the 1840s, sorted food into proteins, fats, and carbohydrates, giving the science its first usable framework. The word moved from the physician's notebook to the laboratory bench.

The 20th century built entire professions around the term: clinical nutrition, sports nutrition, public health nutrition. In 1941, the United States introduced Recommended Daily Allowances, attaching numbers to what 'nutrire' once described in vague humoral terms. The companion word 'nurture' preserves the older warmth, describing not what we eat but how we are raised. Both come from the same act: tending to something so that it grows.