Why taking more fruits and vegetables and take less sodium is important for your healthy bone?

Info source: http://urbanext.illinois.edu/osteoporosis/bonediet.cfm

In general, a bone healthy diet is consuming enough calories for adequate weight, and the optimal amounts of protein, calcium and vitamin D. Consuming the recommended number of servings of fruits and vegetables (2 ½ cups vegetables and 2 cups of fruit for a 2,000 calorie intake), and following the recommendation of no more than 1,500 milligrams (1.5 grams) of sodium per day also contribute to a bone healthy diet.