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Smoking leads to bone loss.  Adults who smoke are more likely to fracture bones, and the risk increases the more you smoke.  Studies indicate that even secondhand smoke can effect bone mass. Too much caffeine can make it hard for your body to absorb calcium.Especially if you don’t get enough calcium in your diet, stick to 2 or fewer cups of coffee or soft drinks per day. Drinking excessively can cause bone loss, so stick to moderate consumption.  One drink per day for women and two for men is okay, and some studies have even shown that alcohol in moderation can help bone health in the long term.
Quit smoking. Cut down on caffeine. Go easy on the alcohol.