Recreational runner Carrie Johnston usually doesn't feel hungry after a good sweat. Exerci

se 【C1】______ Johnston' s appetite, but she knows she needs to 【C2】______ lost calories following a workout.

"When I come home from a good run, I force myself 【C3】______ supper," says Johnston, a dietitian at McMaster University in Hamilton. 【C4】______ Johnston says many female athletes let good eating habits go and riskhealth 【C5】______ thinness. Johnston, who works in the bone-marrow transplant unit at McMaster, has a background in sports 【C6】______ . In 1997, while a student at the University of Guelph, she worked with Prof. Heather Keller on a study for her 【C7】______ on the eating habits of female 【C8】______ .

The 【C9】______ person with eating disorders is driven by a desire to look svelte, says Johnston. But her study focused on athletes who eat less to lower weight and body fat 【C10】______ the belief it will improve 【C11】______ .

The study involved 【C12】______ . 22 elite female athletes between 【C13】______ 15 and 25 over three months. "Years ago when we didn't know any better it was thought that being lighter meant running 【C14】______ ," says Johnston, adding that's still the mentality of many competitive runners, as well as other 【C15】______ like gymnasts and swimmers. Job. nation's study 【C16】______ consumed 400 to 700 fewer calories daily than recommended for their 【C17】______ training.

Even when training more, as they got closer to competing, they failed to 【C18】______ more food fuel for energy. Initially, race 【C19】______ tend to improve when a runner loses some weight, but then they hit a peak and 【C20】______ , says Johnston.

【C1】

A．represses

B．suppresses

C．depresses

D．expresses