Swordfish
A lean source of protein, one 100-gram piece of swordfish serves up more than the recommended daily amount of vitamin D for most adults: 706 IUs, per the USDA. That’s why Rifkin recommends it as a go-to. It’s as simple as grilling up a couple of steaks for an at-home date night.
Herring
One herring filet boasts 306 IUs of vitamin D, per the USDA, which is over half of the recommended daily intake. The flaky fish also contains essential protein, says Rifkin.