Does cow’s milk make strong bones — or weak ones?

Cape Breton Post - - LIVING ROOM - Keith Roach Dr. Roach re­grets that he is un­able to an­swer in­di­vid­ual let­ters, but will in­cor­po­rate them in the col­umn when­ever pos­si­ble. Read­ers may email ques­tions to [email protected]­nell.edu or send mail to 628 Vir­ginia Dr., Or­lando, FL 32803. (

DEAR DR. ROACH: I read that cow’s milk weak­ens the bones. Is that true? — A.H.

AN­SWER: The pre­pon­der­ance of the ev­i­dence is that dairy in­take — like cow’s milk, yo­gurt and cheese — in­creases bone strength and re­duces frac­ture risk. How­ever, there is not the high­est level of ev­i­dence to sup­port this. In ab­sence of in­ter­ven­tional data (where one group is given cow’s milk and the other given some­thing else), we have to rely on other kinds of ev­i­dence, all of which have some po­ten­tial for bias.

Some of these have shown ben­e­fit from drink­ing cow’s milk; oth­ers have not. A 2018 study from the U.S. es­ti­mated a 6 to 8 per­cent re­duc­tion in frac­ture risk from con­sum­ing cheese or milk daily. It’s not clear whether it’s the cal­cium, the vi­ta­min D or some­thing else that may be re­duc­ing risk.

Reg­u­lar ex­er­cise is an­other way to re­duce risk of os­teo­poro­sis and frac­tures. Un­for­tu­nately, some peo­ple will still be at risk for frac­tures de­spite an ex­cel­lent diet and reg­u­lar ex­er­cise, so those at high risk should be screened, and may re­quire med­i­ca­tion. You can re­duce your chances of need­ing med­i­ca­tion through a good life­style, prefer­ably be­gin­ning in young adult­hood.

DEAR DR. ROACH: Do all cer­vi­cal can­cers come from HPV? — B.H.

AN­SWER: One study es­ti­mated that 99.7 per­cent of all cer­vi­cal can­cers world­wide are due to in­fec­tion from hu­man pa­pil­lo­mavirus, es­pe­cially the high­risk strains that are most likely to cause changes in the cells that can be­come cancer­ous. How­ever, most cases of HPV are ef­fec­tively treated by the body, and do not be­come can­cer.

A few can­cers do not have ev­i­dence for HPV when they are looked at. In one re­cent study from the U.S., about 10 per­cent of cer­vi­cal can­cers did not seem to be as­so­ci­ated with HPV, but on care­ful re-eval­u­a­tion, about half of those did have an as­so­ci­a­tion with HPV. Still, there are some cases of cer­vi­cal can­cer that are not due to HPV, and the risk fac­tors for those may in­clude smok­ing and HIV. This type of cer­vi­cal can­cer has a worse prog­no­sis than HPV-re­lated cer­vi­cal can­cer.

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