For people who don't eat fish often, adding sardines once or twice a week can be an easy way to increase seafood intake.

4. They Provide Vitamin B12

Vitamin B12 is particularly important for:

• Normal red blood cell formation

• Nervous system function

• DNA production

Sardines are naturally rich in vitamin B12.

This makes them particularly useful for people who don't regularly consume other B12-rich foods such as meat, eggs, dairy products, or other seafood.

A deficiency in vitamin B12 can cause symptoms such as fatigue, weakness, numbness, and neurological problems, although these symptoms can have many other causes.

5. Sardines Can Provide Calcium

Here's one of the most interesting things about sardines.

Many canned sardines are sold with their soft, edible bones.

Because these bones are small and softened during processing, they can be eaten safely when the product is prepared for consumption.

Those tiny bones are a significant source of calcium.

Calcium is essential for:

• Strong bones

• Teeth

• Muscle contraction

• Nerve signaling

• Normal blood clotting

This makes sardines particularly interesting for people who don't consume much dairy.

6. They're a Source of Vitamin D

Vitamin D helps the body absorb calcium and supports normal bone and muscle function.

Food sources of vitamin D are relatively limited compared with many other nutrients.

Fatty fish—including sardines—can contribute to dietary vitamin D intake.

However, the amount can vary considerably depending on the species and product.

Sun exposure and fortified foods may also contribute significantly to vitamin D status.

7. Selenium Supports Normal Body Functions

Sardines also contain selenium, an essential trace mineral.

Selenium is involved in:

• Thyroid hormone metabolism

• Antioxidant defense

• Immune function

• DNA synthesis

You only need relatively small amounts, but adequate selenium intake is important.

Eating a varied diet usually provides enough for most people.

8. Sardines Can Be a Smart Choice for Weight Management

If you're trying to lose weight, protein can be particularly useful because it tends to be filling.