Nearly 44 million people in the U.S. are living with osteoporosis. The disease, which causes bones to be thin and brittle, strikes women more often than men. It's never too early to make the lifestyle changes that will help develop strong bones:

• Weight-bearing activity. Exercises such as walking, jumping rope, and jogging help build bone. Strength training is also important for bone health.
  
• Calcium. Eat a diet rich in calcium and be sure to get appropriate amounts of vitamin D (through sun exposure and fortified foods -- supplements are also available).
  
• Salt. Limit salt intake as it causes your bones to excrete more calcium.
  
• Break bad habits. Smoking can be bad for bone health as can drinking alcohol and drinking soda.

Check out the gallery for age-specific bone health recommendations.