Adequate calcium intake levels suggested for the United States of America are higher than those accepted internationally, and extend the increased needs of adolescents to young adults. Peak bone mass continues to increase until age of 24 years. Results of bone density measurements support the need for calcium intake beyond that required for calcium balance and retention for growth.
However, the situation in most Asian countries suggests that their populations may have sufficient calcium retention and bone mass despite lower levels of intake.
Calcium intake may need to be adjusted for dietary factors (e.g. observed animal protein, sodium intake, vitamin D intake) and for sun exposure, since both affect calcium retention.
Lifestyle - interests, opinions, and behavioural orientations of an individual, group, or culture.
Personal lifestyle typically reflects individual attitudes, way of life, values, world view, and personal identity. Not all aspects of a lifestyle are voluntary. Surrounding social and technical systems can constrain the lifestyle choices available to the individual. Location is important factor of lifestyle. The nature of the neighborhood in which a person resides affects the set of lifestyles available to that person due to differences in degrees of affluence and proximity to natural and cultural environments.
Lifestyle may include views on politics, religion, health, and intimacy.
For example, "green lifestyle" means holding beliefs and engaging in activities that consume fewer resources and produce less harmful waste, and deriving a sense of self from holding these beliefs and engaging in these activities.