Many respondents said efforts to prevent frailty should start at a relatively young age, with the 40s cited by 30.5 percent, the 50s by 20.9 percent, and the 30s by 20.6 percent. To prevent frailty, those in the prime of their working life should routinely exercise, increase their walking time, maintain muscle mass, get enough sleep and follow a balanced diet, the doctors said. "Protein deficiency leads to reduced muscle mass and heightened risks of normal weight obesity and pre-frailty," said Hiroshi Yoshida, a JPALD director who also serves as director at the Jikei University-affiliated Kashiwa Hospital. "I want people to improve their conditions through dietary habits of consuming meat, fish and dairy products."