This research contradicts the prevailing myth that being overweight causes stronger bones. Now it appears that there is an inverse relationship between body fat and bone density (i.e., increased body fat may cause decreased bone density). This finding may indicate that men with greater abdominal fat tend to be at greater risk of osteoporosis. The research has also found an association between greater muscle mass and increased bone strength.
BOTTOM LINE: Increased belly fat may put you at greater risk of osteoporosis as you age. Your bones will likely become stronger as you gain muscle and lose body fat. To reduce the risk of fractures, perform weight-bearing and strength training exercises (e.g., walking, climbing stairs, lifting free weights) regularly.
Brian Danley, CFT
"Motivation is what gets you started. Habit is what keeps you going."