The top nut that may support immunity, heart health and more

Have you ever looked for one food that might give your immune system a meaningful boost while also helping guard against several health problems? This article looks at selenium, an essential mineral, and the standout food that contains a particularly large amount of it.

What Selenium Does for the Body

Selenium is a trace mineral that plays an important role in keeping the body functioning well. It works as an antioxidant, helping defend cells from damage caused by free radicals. These unstable molecules are produced naturally during normal body processes, and their levels can rise because of smoking, excess alcohol, stress, and an unhealthy diet. When too many free radicals accumulate, they can trigger oxidative stress, a process linked to aging and many diseases.

By helping limit this kind of damage, selenium acts as a protective force for cells. That is one reason it is considered so valuable in supporting overall health.

Main benefits at a glance

• Antioxidant support: Helps fight cell damage from free radicals.
• Cancer protection: May help lower the risk of some cancers by supporting DNA protection and immune function.
• Heart health: Can help reduce inflammation markers associated with heart disease.
• Thyroid support: Important for thyroid function, hormone production, and protection from damage.
• Immune boost: Strengthens the immune response against viruses and bacteria.
• Virus control: May interfere with viral multiplication and mutation.

How Selenium May Help Prevent Disease

One of selenium’s most notable areas of interest is its possible role in lowering cancer risk. This appears to stem from its ability to protect DNA and reduce oxidative stress. It also helps the immune system better recognize and destroy abnormal cells, strengthening the body’s natural defenses.

Selenium may also benefit the heart. It has been linked to lower levels of C-reactive protein, a marker of inflammation in the body. Since inflammation is a major contributor to heart disease, reducing it is important. Selenium also supports glutathione peroxidase, another powerful antioxidant that helps protect cells.

The thyroid is another organ that depends on selenium. The mineral helps protect the thyroid from oxidative injury and supports the production of thyroid hormones, which influence metabolism and energy use.

How Selenium Supports Immunity

When it comes to fighting infections, selenium can be especially helpful. Research indicates that it may strengthen immune defenses against bacteria and viruses. It also appears to increase the activity of T-killer cells, which help identify and eliminate threats in the body.

Selenium can also affect viruses directly by acting on their DNA and RNA. In doing so, it may slow their ability to replicate and reduce the chance that they mutate into more aggressive forms. In short, selenium may help keep viruses under better control.

That said, selenium is not a cure-all. But if intake is too low, the immune system may not work as well, and the body may be more vulnerable to illness. Getting enough selenium is therefore an important part of maintaining strong defenses.

Foods That Provide Selenium

Here are 10 foods that are especially rich in selenium, based on a 100-gram serving:

1. Brazil nuts: 1917 micrograms. Just one ounce, or about 6 to 8 nuts, provides 544 micrograms — more than 175% of the daily recommended amount.
2. Whole wheat pasta: 73 micrograms.
3. Tuna: 65 micrograms.
4. Chia seeds: 55 micrograms.
5. Sunflower seeds: 53 micrograms.
6. Salmon: 47 micrograms.
7. Shrimp and most shellfish: 38 micrograms.
8. Turkey: 36.8 micrograms.
9. Beef: 36 micrograms.
10. Eggs: 31.6 micrograms.

Brazil nuts are by far the most concentrated source on the list. Even one nut can provide a sizeable share of daily selenium needs.

Why Selenium Intake May Be Too Low

Even with good food sources available, many people still do not get enough selenium. One reason is that soils in many growing regions have become depleted of minerals, including selenium. Some medications, high stress, and digestive problems can also affect how well the body absorbs and uses it.

Because of that, it makes sense to include selenium-rich foods as part of a balanced diet. If you often feel worn down or get sick frequently, your selenium intake may be worth reviewing. Adding more selenium-rich foods — or speaking with a healthcare professional about supplements — could make a difference in how you feel overall.