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Packaged Food Science

Why Canned Foods May Be More Nutritious Than The Fresh Stuff

When it comes to comparing fresh food versus canned food, one of the starkest differences between the two has to be shelf life, or how long a product can last. Most produce and meats won’t stay fresh more than a couple of days, even in the fridge or after being cooked. They’ll begin to lose flavors, change texture, and eventually spoil. Canned food, on the other hand, won’t change at all over the course of months, or in some cases, even years.

Of course, this leaves the question of how canned goods can keep for as long as they do without going bad. This has led to a number of misconceptions about the entire industry, including that they use a plethora of preservatives (not really) and are less healthy than their fresh counterparts (in some cases, canned food may actually be healthier).

Once you understand how canning works, though, it may open your eyes as to how the shelf-stable food is not only good to eat months after its made, but also why it may be, in some cases, a more nutritious option than consuming fresh food.

The History and Science of Canning

The process of canning was first invented in the early 1800s by French chef and candymaker Nicolas Appert. He developed canning as a way to preserve food using heat that won a prize from Napoleon Bonaparte, who was looking for a novel way to feed his troops. Appert first started by sealing foods in glass jars with wax. This was later shifted to tin cans, the basis of modern canning operations today.

Appert’s process was a form of sterilization, only instead of using chemicals (which is what many people recognize it as today), he was using heat to kill bacteria. This was similar to what Louis Pasteur did in 1864 when he invented the pasteurization process used in milk and juices, but Pasteur was looking to just kill pathogens, or disease-causing microbes. Other bacteria, including those that didn’t need oxygen (called anaerobes), could still grow and multiply over time.

Where Appert’s process differed was in that he used an airtight environment, as well as a greater amount of heat. This combination meant that bacteria and other spoilage microbes inside would be killed and unable to regrow. One of the biggest threats came from anaerobic bacteria that produce heat-resistant spores. The type of sterilization in canning uses enough heat to prevent these spores from ever having the chance to grow and multiply.

All of this happened without the need for preservatives that go into products like packaged cereals and other shelf-stable foods. While some canned products contain salt, sugar, or acidic products like vinegar, these are meant more for flavor, color, and texture than they are for the preservation properties they often have in foods.

Sterilization does also cook the food inside, meaning that textures will change as a result.

How Canning Changes Food

Today, canning has evolved to utilize more sturdy packaging and scientifically-controlled heat. Food processors use enough heat at an appropriate time needed to kill the requisite bacteria or spoilage organism in question. Scientists target specific microbes for each food based on its acidity, moisture content, the heat resistance of the target microbe, and other factors.

More than just keeping bacteria from spoiling food over months, though, canning has other benefits. One of the biggest is that food preserved by canning is often sterilized straight from being harvested. Over time, the nutritional and sensory qualities of food decrease over time when exposed to a normal environment. This means that technically, a peach that’s been on the shelf for a couple weeks has less available nutrients, flavor, and color than one picked fresh from the tree. Compounds naturally break down over time, so this is natural.

In canning, however, food is preserved much closer to the harvest point, and are subject conditions (including that airtight seal) that prevent degradation from occurring as fast. Thus, nutrients may be more available from a canned food compared to the fresh version in grocery stores. That’s not true for all nutrients, however. Some water-soluble nutrients like Vitamin C and some B vitamins, leach into water surrounding the food or are destroyed by heat while the food is sterilized. You’ll see a decline in these nutrients overall when cooking, regardless of process.

The next time you’re looking at purchasing canned food and judge it for being “lower quality,” as its often perceived, you might want to keep the above in mind. More often than not, canned food is just as nutritious as the fresh variety and can last a lot longer without the need for preservatives.


Information used in this article was obtained from: 

Fellows, P. J. (2009). Food Processing Technology: Principles and Practices, 3rd Edition. Cambridge: Woodhead.

Categories
News

Trader Joe’s Catching Heat For Allegedly Under-filling Tuna Cans

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A class-action lawsuit was filed against Trader Joe’s that claims the chain isn’t filling its tuna cans enough to meet federal standards.

These allegations specifically fall on the Albacore Tuna in Water Half Salt and Albacore Tuna in Olive Oil Salt Added. So the cans of tuna are five ounces in size. However, they’re only required by law to have at least 3 ounces of fish in them.

Allegedly, Trader Joe’s Tuna in Water Half Salt only average 2.43 ounces per can and its Tuna in Olive Oil Salt Added averaged 2.87. Neither of those averages meet the 3-ounce federal standard. While those numbers don’t seem like much, consumers are getting about 25 and 11 percent less fish than they’re expecting.

According to the lawsuit, every can of Trader Joe’s tuna the US National Oceanic and Atmospheric Administration tested didn’t meet the fill requirement and was shy of 3 ounces.

Photo: Google Maps

Categories
Packaged Food

355,000 Cans Of SpaghettiOs Recalled For Plastic Bits In The Sauce

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Campbell Soup Company is issuing a recall of 355,000 SpaghettiOs cans after it was discovered that pieces of red plastic lining was found in the tomato sauce. Consumerist reports that because of the choking hazard that this presents, the company is recalling the cans of Original Flavor.

The 14.2 ounce cans in question have February 22, 2016 on the bottom of each lid with a UPC number of 51000 22432. Campbell says to return the cans to the store where they were purchased, but if consumers are unable to, they should call the company’s recall line at 1-866-535-3774.

Can’t have plastic bits interrupting our SpaghettiOs time.

While the pieces of plastic were discovered through numerous customer complaints, it doesn’t look like anyone was hurt yet from the product.

Photo: SpaghettiOs

Categories
Hit-Or-Miss

Coke Releases Braille Cans For The Blind

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Coca-Cola’s “Share a Coke” campaign has made for some pretty cute moments so far. The popular promotion features cans and bottles redesigned to feature various names. It looks like the beverage company is going one step further in its campaign with a limited run of braille-covered cans.

As a new way for blind customers to enjoy Coke, the new cans will feature a variety of braille names printed on the beverage. Working with Anónimo, a Mexican ad agency, Coke developed a machine that dispenses the limited-edition braille cans in South America.

Categories
Hit-Or-Miss

We’re Gonna Pop Some Tabs – 10 Awesome Beer Can Designs

Now that we’ve learned craft beer is on the rise, thanks to Budweiser’s admittance, let’s take a look at an offshoot of the craft beer craze. It’s one thing to drink craft beer; it’s another to drink it out of a can. I love a good beer in a can. It combines the joy of having a beer, with just enough nostalgia to make for a wonderful experience. Drinking beer from a can hearkens back to a past world, an homage to the working class of the 50’s. Or at least that’s what I think while I drink. Paste Magazine recently came out with their 30 best beer can designs. I picked my top ten but you can get the full list here.

 

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10.  Cervecería Sagrada, Mexico: Craft brew meets Mexico in this fantastic masked can.

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9. Westbrook Brewing, South Carolina: Love the type face, and the seemingly hand-typed details.

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8. Santa Fe Brewing Company: Simple design. Geographically relevant. Spot on.

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7. 21st Amendment Brewery, San Francisco: You can never go wrong with putting historical figures at the forefront of your marketing, just ask Lincoln the Vampire Slayer.

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6. Austin Beerworks, Austin: That is one bold A.

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5. 21st Amendment Brewery, San Francisco: Dick Tracy anyone?

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4. Brindle Dog Brewing Company, Florida: Now this is bringing that 50’s nostalgia to plain sight.

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3. Payette Brewing Co, Idaho: If cowboys drank beer in modern saloons, this would be their go-to drink.

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2. Stella Artois: There’s just something about a Stella in red.

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1. Churchkey Can Co., Seattle: Great design, peep the old-school punch top can.

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H/T + PicThx PasteMagazine