ABSTRACT
Relative Energy Deficiency in Sport (RED-S) is a phenomenon that is caused by two factors: reduced energy intake and increased energy output. It occurs in both men and women. It results in reduced exercise performance capabilities, reduced protein synthesis, and altered hormone levels which could lead to for, example, amenorrhea in women. Under the current high-school guidelines of being allowed to lose 1.5% of bodyweight per week during the season it is quite possible that RED-S could happen in high-school and collegiate athletes.
