What happens to our body after the age of 30?

And don’t forget about vitamin D to help you absorb all that calcium. The most effective way to get the vitamin D you need is through a combination of sun exposure and vitamin-rich foods like salmon, herring, and tuna. That said, in summer you risk burning, since sunblock stops the UVB rays that need to hit your skin to start the vitamin D production process. In winter, depending on where you live and how much melanin is in your skin, it can easily take more than two hours of midday January sunlight each day to meet your vitamin D requirements. So you might want to add supplements to your diet as well, especially if you live in a climate where you cover up during the winter, have darker skin, or both.