Right now people are a little fearful of eggs, and who can blame them? The recent salmonella outbreak that resulted in the recall of half-a-billion eggs and sickened more than a thousand people across the country has left people wondering just how safe our food supply is. As a nutritionist, people ask me about this a lot—and what’s most important to understand is that all eggs are not created equal. The industrial food industry has taken our foods and made many of them unsafe. Not only this, but the nutritional value of our foods is intricately tied into this same industry. Which leads to another question I often hear: What are the healthiest foods? This should be an easy question to answer, but with the industrial food complex wrecking havoc on our food supply, things have become far more complicated.

Eggs prove to be the perfect example, something that can be an extremely healthy food. I wish I could stop there, but the great variation in the quality of eggs makes this impossible. If we are talking about local, small-scale, farm-raised eggs from chickens that live on pasture and spend plenty of time outside, then yes, eggs are quite possibly the perfect food. Unfortunately, the vast majority of Americans don’t have access to eggs produced this way. On the other hand, if we are talking about the average egg that you pick up in a supermarket, then no, eggs are not very healthy at all. Not only are they unhealthy, but they can actually be unsafe to eat as this most recent recall illustrates.

So what makes industrially-produced eggs so different? Let’s start with the safety issues. Eggs that come from hens confined to battery hen houses are not produced in sanitary conditions. Tens of thousands of cramped chickens spend their short lives either lined up in tiny cages or crowded into open henhouses, standing in their own feces, unable to move around or gain access to fresh air or sunlight. They are stressed and often sick.

Since the late 1980s, salmonella has been a major problem in these giant warehouses. One giant producer in particular, Austin DeCoster of Wright County Egg, has been responsible for multiple outbreaks of salmonella over the years, according to yesterday’s New York Times article. State regulators were so concerned, that for a period of time, New York and Maryland even banned the sale of DeCoster eggs. Salmonella can be quite serious to those with a weakened immune system, babies, young children, the elderly, and pregnant women. According to the Times article, in one of the earlier DeCoster egg outbreaks, nine people died. Salmonella has also been linked to a host of chronic ailments, including reactive arthritis, Reiter’s syndrome, Miller-Fisher syndrome, and ulcers.

When it comes to nutrition, it is not widely known or understood that the industrial egg is significantly less healthful than the egg from a pasture-raised chicken. The industry has managed to take real foods, like eggs, and make them not only unsafe, but also less nutritious. Mother Earth News completed a study in 2007 that compared the nutritional profiles of industrial eggs versus eggs from pasture-raised chickens and found substantial nutritional differences. According to the study, eggs from pasture-raised chickens contained two-thirds more vitamin A, three to six times more vitamin D, two times more omega-3 fatty acids, three times more vitamin E, and seven times more beta-carotene than their industrial counterparts.

Why? Industrial eggs are fed processed grains (usually genetically modified corn that is heavily sprayed with pesticides). This is not the chicken’s natural diet. Chickens are omnivores and will eat grass, seeds, insects, grubs and whatever else they find while roaming on pasture. This varied diet results in a more nutrient-dense egg, which is higher in omega-3 fatty acids, vitamin A and beta-carotene. In addition, chickens that live outdoors convert sunlight into vitamin D and other nutrients that store in their eggs.