They are all true
adolescence, and early adulthood are the times when we can significantly increase our peak bone mass through diet and exercise. Not surprisingly, we can also make choices that decrease peak bone mass, such as smoking, poor nutrition, inactivity, and excessive alcohol intake.
osteoporosis is much more common in women than in men (who do not experience this acute loss of hormone in middle age).
Bones grow rapidly during adolescence, and teens need enough calcium to build strong bones and fight bone loss later in life. ... If people aren't getting enough calcium in their diet, the body takes calcium from the bones to ensure normal cell function, which can lead to weakened bones.