Nitrates have been around for centuries—even longer. A food additive widely known for its presence in deli meats, nitrates are nitrogen compounds. But are they harmful, healthy, somewhere in between? We break down the facts.

What are nitrates?

Nitrates are naturally occurring compounds that consist of oxygen and nitrogen. We say 'naturally occurring' as nitrites have an organic presence in animals, including humans, as well as in water, soil, and various plants.

There are also added nitrates, which humans have been putting into foods.

How do nitrates and nitrites differ?

People often talk about nitrites and nitrates interchangeably because the compounds are in the same chemical family—but there is a difference between the two. While both are oxygen and nitrogen compounds, nitrates (NO3) have three oxygen atoms that bond with one nitrogen atom, whereas nitrites (NO2) have only two oxygen atoms.

This slight chemical variation can make a difference in how our bodies digest and convert them. When consumed, nitrates can naturally convert to nitrites in our bodies. Biological research shows nitrites and their two oxygen atoms to be more chemically prone to react with other chemicals. Additionally, some nitrites convert to nitric oxide in our bodies, a chemical that aids in brain functioning and blood flow regulation.

Where are nitrates found?

Naturally, nitrates are abundant in some vegetables, including:

Leafy greens
Beets
Spinach
Celery

Nitrates are also naturally found in animal meats, poultry, and dairy.

Why are nitrates added to foods?

While nitrates organically show up in nature, humans have been purposefully adding nitrates to foods for centuries, with some historians starting as early as 3000 BC. The main reason for adding nitrates to food is for preserving purposes. Nitrates keep bacteria, particularly clostridium botulinum, and other organisms from growing.

But more recently, particularly in the past century with the proliferation of processed foods, nitrates were also lauded for their ability to improve the texture and appearance of meats. This is why nitrates are so widely and rightfully associated with processed meats, such as cold cuts and hot dogs. They keep these processed foods shelf-stable and give them that certain pink hue and specific texture.

Are nitrates harmful?

When it comes to naturally occurring nitrates, the research underscores that these have benefits. For one, these compounds are natural and are found in some of the most essential and healthy foods to consume, such as leafy greens. Also, as we noted, when consumed nitrates convert to nitrites which then convert to nitric oxide—and nitric oxide plays a role in regulating blood pressure, not to mention other benefits such as boosting circulation. A 2019 study found that eating dietary nitrates through about one daily cup of vegetables can reduce heart disease. Of course, other nutrients in these vegetables play a critical health role.

Now when we start looking at added nitrates, things get murkier. There’s been wide speculation that nitrates are potentially harmful to our health. Various reasons propel this: One is that when certain foods with added nitrates are cooked on high heat, the nitrates convert to nitrites which then convert to the chemical nitrosamines, which health studies have linked to cancer in laboratory animals.

Furthermore, a 2015 report from the World Organization (WHO) flat-out said that eating processed meats could lead to colon cancer. But is this all because of the nitrates or because of other factors related to processed foods? The jury is still out on this one, but the evidence has many heads turning—so much so that WHO considers processed meats with nitrates to be a Group 1 carcinogen.

Additionally, various advocacy groups and researchers have warned and continue to warn that added nitrates are potentially harmful and carcinogenic.

Our PrimaFoodie Take

We confidently and wholly say: We avoid added nitrates. Our reasons vary.

For one, we always ask: If something doesn’t need to be in a food, why add it or consume it? We now have the refrigeration capabilities to keep meats and other items fresh without the need for such preservatives.

Also, the research mentioned above gives us great pause. Our bodies respond differently to natural nitrates versus human-manipulated and added nitrates. If WHO has been warning against nitrate-added foods, we’re listening. Like so many additives, consuming these in small amounts may be fine, but the cumulative effects could very well be dire.

But here’s the bigger conversation: Foods that contain added nitrates are often ultra-processed and filled with other manipulated and unhealthy additives. Nitrates or not, we view most processed foods as a threat to our wellbeing. Give us fresh organic vegetables and a steak over processed deli meat any day.