“Sardines deliver calcium directly in an absorbable form, especially when eating the edible little bones. They are rich in vitamin D and a great source of protein,” she said. To this point, one 3-ounce serving of sardines contains 325 milligrams of calcium, which is roughly 30% the recommended daily amount for older adults. The same serving has 46 microunits of vitamin D, which is about 17% of the recommended daily amount for older adults. (That means you’re still going to have to rely on other foods or supplements – and sunshine in the case of vitamin D – to get enough.) To get the maximum bone benefits out of sardines, Garcia recommends eating them two to three times a week.
Article source: https://www.huffingtonpost.co.uk/entry/best-food-bone-health-over-50_uk_69fa0d2de4b055e1a49701d7