women+55 & men+70,
by reading medical test
give a chart if possible.

In BMD test results, bones are compared to the bones of an average young adult. A score (called a T-score) is calculated that describes the density of the bones (usually at the spine and hip) and tells how strong the bones are compared to this average.

The T-score is expressed in units referred to as “standard deviations” (SDs). These SD units tell us how far one differs (or deviate) from what is considered normal for a young adult.

“Below normal” is always indicated with a minus (-) sign. According to World Health Organization (WHO) classifications, a T-score below –2.5 SDs indicates osteoporosis and a score between –1 and –2.5 SDs indicates “osteopenia” or low bone density. Normal bone density is no more than 1 SD below the young adult normal value.

Charts and further info at the link below:

During childhood and adolescence, much more bone is deposited than withdrawn, so the skeleton grows in both size and density. Up to 90 percent of peak bone mass is acquired by age 18 in girls and age 20 in boys, which makes youth the best time to "invest" in your bone health.

The amount of bone tissue in the skeleton, known as bone mass, can keep growing until around age 30. At that point, bones have reached their maximum strength and density, known as peak bone mass. In women, there tends to be minimal change in total bone mass between age 30 and menopause. But in the first few years after menopause, most women experience rapid bone loss, a "withdrawal" from the bone bank account, which then slows but continues throughout the postmenopausal years. This loss of bone mass can lead to osteoporosis. Given the knowledge that high peak bone density reduces osteoporosis risk later in life, it makes sense to pay more attention to those factors that affect. So basically no unless you have a bone condition which causes rapid bone loss.

http://www.niams.nih.gov/Health_Info/Bone/Osteoporosis/bone_mass.asp
here is the website where you can get more information

Also, what are the measures you can take to prevent the onset of osteoporosis as you age(about 21)?

Every person (and animals of numerous other species) is at risk for osteoporosis. While more common in females than males (due to hormonal influence), and while more common in Caucasians than other races, osterporosis risks increase not only with certain lifestyle issues (such as smoking, inadequate nutrition, excessive drinking, anorexia, etc.), but also as a simple factor of growing older. As humans age, as a rule, their bodies become more fragile, chemical absorption through the GI tract becomes less efficient, and cells do not regenerate with the same vigor nor at the same rate as in younger people. So, everyone is at risk for this and many other conditions more commonly found in the older population. There are many suggestions which MAY reduce a person’s risk, such as adequate nutrition during younger years, particularly having an adequate intake of Calcium, which can also be continued into older age. Adequate exercise, correct posture, appropriate fluid intake (water particularly), adequate sleep, use of anti-inflammatory medications (such as simple aspirin or generic tylenol or other NSAIDs), not smoking, minimal use of alcohol, avoidance of hormone replacement therapy when possible, use of daily multivitamins, etc., are all thought or have been shown to be correlated with reduced risk of osteoporosis. You are never too young to begin these interventions, and the younger you start them, the greater the benefit which may accrue.

It is probably the diets that differ somehow. There is no proof that genetics has anything to do with it. Do white folks get less exercise? That could be a key factor.
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Osteoporosis
From the book, "The RAVE Diet and Lifestyle" by Mike Anderson from pages 186 to 190

Scientific literature clearly states that a "calcium deficiency disease" due to a low calcium intake from natural diets simply does not exist. – quoted from John A. McDougall, McDougall’s Medicine

The American diet causes us to have blood which is too acidic. When blood becomes too acidic our bodies pull calcium from our bones and teeth to neutralize the acid and this results in bone loss or osteoporosis. To correct this problem diet changes are needed. It is necessary to cut back on all highly acidic foods.

Animal proteins are on of the most acid forming foods in existence and the biggest cause of high acid levels in most Americans. One reason dairy products are poor choices for calcium is because they contain excessive amounts of protein. Cow’s milk has over 3 times more protein than human mother’s milk. It was after all, designed for a calf that will weigh 300 pounds within a year of it’s birth. Low fat dairy products are highest in protein, so you may lower your fat intake but you will raise your blood acid level and this will contribute to bone loss. Skim milk, for example, contains almost twice the amount of protein than whole milk.

The cause of osteoporosis is NOT a lack of calcium in the diet, regardless of the advertising from the dairy industry. Populations that consume the highest amounts of calcium [such as in the USA] have the highest rates of osteoporosis.
The problem is that the dairy industry has set US standards for calcium consumption through lobbying efforts . The calcium scare that has been going on in this country is, without question, the biggest nutritional scam ever conceived.

Bones are like muscles. The single best thing you can do to prevent (and reverse) osteoporosis is to start exercising your bones, because a lack of physical activity is the primary cause of osteoporosis. This isn’t to say that diet is not a contributing factor.

There are lots of meat eaters with strong bones. This is because their activity levels strengthen their bones despite their bad diets. Did you ever notice that obese women and men never get osteoporosis? This is because their bodies get lots of weight bearing exercise just carrying their bodies around, regardless of their diet and calcium intake.

A recent study showed that varying levels of calcium intake, ranging from 500 to 1800 mg a day had absolutely no effect on bone strength. It was the exercise women got that was the key determinant in building strong bones. Don’t worry about calcium. do worry about exercise.

Cows don’t produce calcium. They’re simply storage systems for the calcium they get from the plants they eat. Plant foods will keep your blood acid levels in balance because they’re alkaline not acidic. Like protein, calcium is found in all plant foods and the amounts will easily satisfy both growing children and adults.
Milk (2% fat) has 245mg of calcium per 100 calories. Romaine lettuce has 257, broccoli has 387, spinach has 450.
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Both magnesium and vitamin D are essential to absorbing calcium and Vitamin K plays a big role in putting calcium in the bones and keeping it out of the soft tissues such as kidneys [stones] and arteries [arteriosclerosis].

Perhaps those with darker skin are able to produce more vitamin D from being in the sun? That alone could be a contributing factor.

This is Part 2 of 3, of our Health talk on Osteoporosis

Duration : 0:9:50

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http://www.encognitive.com
Vitamin D: importance in the prevention of cancers, type 1 diabetes, heart disease, and osteoporosis.

The purpose of this review is to put into perspective the many health benefits of vitamin D and the role of vitamin D deficiency in increasing the risk of many common and serious diseases, including some common cancers, type 1 diabetes, cardiovascular disease, and osteoporosis. Numerous epidemiologic studies suggest that exposure to sunlight, which enhances the production of vitamin D3 in the skin, is important in preventing many chronic diseases. Because very few foods naturally contain vitamin D, sunlight supplies most of our vitamin D requirement.

25-Hydroxyvitamin D [25(OH)D] is the metabolite that should be measured in the blood to determine vitamin D status. Vitamin D deficiency is prevalent in infants who are solely breastfed and who do not receive vitamin D supplementation and in adults of all ages who have increased skin pigmentation or who always wear sun protection or limit their outdoor activities. Vitamin D deficiency is often misdiagnosed as fibromyalgia.

A new dietary source of vitamin D is orange juice fortified with vitamin D. Studies in both human and animal models add strength to the hypothesis that the unrecognized epidemic of vitamin D deficiency worldwide is a contributing factor of many chronic debilitating diseases. Greater awareness of the insidious consequences of vitamin D deficiency is needed. Annual measurement of serum 25(OH)D is a reasonable approach to monitoring for vitamin D deficiency. The recommended adequate intakes for vitamin D are inadequate, and, in the absence of exposure to sunlight, a minimum of 1000 IU vitamin D/d is required to maintain a healthy concentration of 25(OH)D in the blood.

http://www.ajcn.org/cgi/content/abstract/79/3/362

Duration : 0:7:58

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In this lecture Sayer Ji, founder of www.GreenMedinfo.com deconstructs predominant conventional health myths regarding bone health. The 1 hour long lecture discusess: 1) why calcium supplements may weaken the bone 2) why having higher bone density may increase the risk of breast cancer 3) why pharmaceutical intervention is intrinsically flawed and not as logical as using natural substances. 4) how Medline data is vindicating the efficacy of natural substances in the prevention and treatment of bone density. 5) Why “osteopenia” and “osteoporosis” take on a less ominous light when one better understand the inherent problems associated with using the T-score from DEXA scans.

Duration : 0:9:51

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Technorati Tags: bone density, bone health, health myths, osteoporosis

The 1 hour long lecture discusess: 1) why calcium supplements may weaken the bone 2) why having higher bone density may increase the risk of breast cancer 3) why pharmaceutical intervention is intrinsically flawed and not as logical as using natural substances. 4) how Medline data is vindicating the efficacy of natural substances in the prevention and treatment of bone density. 5) Why “osteopenia” and “osteoporosis” take on a less ominous light when one better understand the inherent problems associated with using the T-score from DEXA scans.

Duration : 0:9:39

(more…)

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In this lecture Sayer Ji, founder of www.GreenMedinfo.com deconstructs predominant conventional health myths regarding bone health. The 1 hour long lecture discusses: 1) why calcium supplements may weaken the bone 2) why having higher bone density may increase the risk of breast cancer 3) why pharmaceutical intervention is intrinsically flawed and not as logical as using natural substances. 4) how Medline data is vindicating the efficacy of natural substances in the prevention and treatment of bone disease 5) Understanding the inherent problems associated with using terms like “osteopenia” and the inherent weakness of using T-Scores and DEXA scan data to ascertain bone health.

Duration : 0:9:54

(more…)

Technorati Tags: bone, density, health, myths, osteoporosis

www.GreenMedinfo.com deconstructs predominant conventional health myths regarding bone health. The 1 hour long lecture discusess: 1) why calcium supplements may weaken the bone 2) why having higher bone density may increase the risk of breast cancer 3) why pharmaceutical intervention is intrinsically flawed and not as logical as using natural substances. 4) how Medline data is vindicating the efficacy of natural substances in the prevention and treatment of bone density. 5) Why “osteopenia” and “osteoporosis” take on a less ominous light when one better understand the inherent problems associated with using the T-score from DEXA scans.

Duration : 0:9:57

(more…)

Technorati Tags: bone density, osteopenia, osteoporosis