Calcium is needed to have strong bones. If you consume enough vitamin D, then you do the right thing! This vitamin helps our bodies to absorb calcium from foods. Tanning long hours is never healthy, but do not avoid the sun, because when you expose yourself to sunrays, your organism starts producing vitamin D. If you live in a cold country, eat foods that are rich in this vitamin, such as salmon. Grill the fish or bake it first. And don’t forget to add collard greens.