Sample day of eating calcium-rich foods2 cups of Total cereal (516 mg) 1 cup strawberries (21 mg)24 almonds (70 mg)1 cup of grapes (19 mg)1 orange (52 mg)1 cup of cooked spinach (245 mg)1 cup brown rice (20 mg)Trout (57 mg)And be sure to make sure you’re getting enough vitamin D (click here to see how much you need); your body needs sufficient levels in order to absorb calcium. More From Prevention: How To PreventOsteoporosis