Deficiency
A deficiency was a lack of a certain biochemical compound in one's system.

In 2267, Spock speculated that Alexander likely had a biochemical deficiency relative to Platonius. Doctor Leonard McCoy later determined via a comparative test that he was unable to metabolize kironide due to a lack of pituitary hormone. ()

In 2371, The Doctor speculated that a dirt-eating Kes might have a nutrient deficiency, as humanoids often craved foods with high concentrations of the vitamins or minerals they lacked. ()

See also 
 Malnutrition

External link

Biochemical compounds
Medical conditions