A food preservative is a substance added to foods to make them last longer; to “preserve” them. Preservatives are added to foods that go bad quickly and have found themselves in all kinds of products in our supermarkets.
Preservatives work to preserve food in a few different ways. Some prevent the growth of bacteria and mould. Others prevent delicate fats from going rancid.
There are so many preservatives out there. While preservatives added to foods should be “approved,” this doesn’t mean they’re guaranteed to be safe for everyone always. And it doesn’t mean that the food is healthy.
Foods with preservatives are more-processed, less-nutritious foods to begin with – not exactly health foods. So, even if you don’t mind preservatives, you probably should cut down on these kinds of foods, anyway.
So, let’s learn more about a few common food preservatives.
That’s right – salt.
FUN FACT: The term “salary” is from the Latin word for salt. It’s thought that it came from the ancient Romans who would pay employees, allowing them to buy salt. Either that, or it was for their work conquering and/or guarding salt mines/roads. Either way, salt was sought because of its ability to preserve food before the advent of refrigeration.
In today’s day and age, with fridges and freezers in every home and supermarket, and refrigerated lorries, salt is not needed for food preservation as much. But our taste buds still seem to crave it on an epic scale.
Too much chemical salt AKA table salt can increase blood pressure and the risk of heart attack and stroke.
Rock salt and sea salt have a much more balanced mineral profile and are thought to be beneficial in small doses. Unfortunately, it’s chemical salt that you’ll find used as a preservative.
Click here to read more about salt.
Preservative: Nitrites (nitrates and nitrosamines)
Nitrites are preservatives added to processed meats. They’re not bad in and of themselves, but they do turn into harmful chemicals called nitrosamines. Nitrosamines are carcinogens found in cigarette smoke. Nitrites form nitrosamines when they’re cooked at high heat, and sometimes even when exposed to the high acid environment of the stomach.
Nitrites are added to meats to keep the pink-red colour and prevent “browning.” Mostly in bacon, ham, sausages and lunch meats. Since nitrites can change into nitrosamines, nitrites are one-step away from being the “bad guys.”
Another interesting thing is that processed meats have been linked to colon cancer. Because of the nitrites? Perhaps, but either way, nitrosamines are a confirmed health-buster.
Since nitrosamines (from nitrites) are the bad guys and are formed by cooking nitrites at high heat, what are nitrates?
Nitrates are naturally found in many healthy foods like vegetables. They’re especially high in beets. Sometimes our enzymes or gut bacteria change these healthy nitrates into nitrites. However, they rarely form nitrosamines because they’re two-steps away from becoming these “bad guys.”
Preservatives: BHA & BHT
Have you seen on packages “BHA/BHT has been added to the package to help maintain freshness?” Perhaps on cereal packages or in gum? Guess how these compounds maintain freshness? Because they’re preservatives.
BHA (butylated hydroxyanisole/ E320) and BHT (butylated hydroxytoluene/ E321) are antioxidants added to many processed foods. The main way BHA and BHT work is by preventing fats from going rancid. Are they safe? Well, they’re approved for use as a preservative at small doses. However, some studies show they can cause cancer in animals at high doses. Again, they’re added to processed pre-packaged foods, so it’s wise to avoid them nonetheless.
There are a lot of preservatives in our food supply. These compounds work by preventing the growth of bacteria and mould, or by preventing fats from going rancid. And they’re mostly found in processed foods. If you want to avoid them. Eat fresh foods.
Does this information make you want to read all your food ingredient labels now? Let me know in the comments below!