Chocolate contains a substance (oxalate) which may inhibit the absorption of calcium. This, theoretically, would lead to lower bone density, as found for women in one study. However, more studies need be done, especially when chocolate contains flavanoids (good substances beneficial to bones).
I don't normally recommend eating chocolate anyway because of higher caloric density. You could get the same nutrients (antioxidants) from fruits. To strengthen your bones, I recommend having more dairy products such as milk and yogurt (especially if you do eat chocolate.)
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