Which one of the following choices best represents a health risk associated with being underweight?
a. susceptibility to disease
b. hair loss
c. nausea and vomiting
d. heart valve damage
i know the answer isnt d. i tried that as a recommendation by someone else and got it wrong the first time.

these are common warning signs of overtraining syndrome:

washed-out feeling, tired, drained, lack of energy

mild leg soreness, general aches, and pains

pain in muscles and joints

sudden drop in performance

insomnia

headaches

decreased immunity (increased number of colds, and sore throats)

decrease in training capacity/intensity

moodiness and irritability

depression

loss of enthusiasm for the sport

decreased appetite

increased incidence of injuries.

a compulsive need to exercise

what are the choices?