I beleve they have to get recertification every year but I may be wrong, with me reserach this is what I believe to be the correct answer
Answer:
After about age 40 to 50, the body starts to break down bone mass faster than it builds it.
Explanation:
This is part of the natural aging process. Both men and women experience bone loss with age.
hope this helped!
Dicke says this because the world’s population is growing and soon there will not be enough meat for everyone.
Drugs/Tobacco.
Alcohol.
Sexual Activity.
Poor Diet.
Behavior that may cause injury.
Sedentary Lifestyle.