More than a teaspoonful is too much
University of Illinois College of Agricultural, Consumer and Environmental Sciences
More than 90% of Americans consume too much
sodium, which can lead to hypertension, high blood pressure, and increased risk
of heart disease and stroke.
Most
of the excess sodium comes from processed and packaged foods, so the food
industry and food scientists continuously look for ways to reduce sodium. A new
paper from the University of Illinois provides a comprehensive review of
scientific literature on sodium reduction strategies in food production.
"Sodium overconsumption is a huge health concern, and the FDA has recommended sodium reduction in food since the 1980s, but we haven't succeeded yet. While the unit volume of salt in the food supply has not increased, the amount of sodium consumption has gone up, because we just consume a lot of food," says Soo-Yeun Lee, professor in the Department of Food Science and Human Nutrition (FSHN) at U of I and co-author on the paper.
We
only need around 450 milligrams (mg) of sodium per day, and the recommended
maximum amount is 2,300 mg, or 1,500 mg for those at risk for hypertension. But
average consumption exceeds 3,000 to 3,500 mg per day -- or 50% to 100% above
the upper limit. More than 70% of our sodium intake comes from processed and
packaged foods, primarily cured meats, bread, cheese, and soups.
The
researchers conducted a scoping review including primary studies, literature
reviews, book chapters, and patents covering sodium reduction in food products.
They focused on studies that included sensory data with human subjects, because
palatability is essential for consumer acceptance.
"In
this review, we looked at different food systems. The way you would reduce salt
in a solid system, like a topical application on snack foods, such as salted
peanuts or salted chips, would be very different from embedded application in
semi-solid foods like cheese or bread. And in a liquid system like soup, where
it is completely dissolved, it would be really different in the way we could
reduce salt yet provide the palatability it gives," Lee states.
"We're
hoping this work will provide insight into the wide variety of salt-reducing
technologies that exist. This can help food companies be more informed to use
different strategies than what they have been doing," she adds.
The
researchers identified five main strategies: Salt reduction, salt replacers,
flavor modification, physical modification, and functional modification.
"The
most obvious one is to remove salt from the recipe, and that is a key component
in all of the strategies when sodium reduction is the goal," says Aubrey
Dunteman, graduate student in FSHN and lead author on the paper.
But
it is not possible to completely eliminate sodium, because it has both sensory
and functional properties. For example, it is used for meat preservation and to
make bread dough rise.
"A
lot of the studies we looked at combined more than one method, such as salt
removal with salt replacers and flavor modification or salt removal and
physical modification," Dunteman says.
Many
studies used salt replacers such as potassium chloride, calcium chloride, or
other chloride or acid salts. However, these substitutes tend to have a bitter
taste, so they are often used in combination with flavor modifications, such as
umami substances or bitter blockers.
"Another
method is physical modification. For example, you can encapsulate the salt
crystals, which changes how the salt is dissolved in the mouth. This can alter
the saltiness perception allowing for a reduction in the amount of sodium
necessary to create the salty taste. You can also create an uneven distribution
of the salt in a product that can further help enhance the perceived saltiness
of the food product through taste contrast," Dunteman explains.
"Finally,
there is functional modification. For example, you could move away from a
sodium-based preservative in cured meats, perhaps using a celery-powder
preservative instead of sodium nitrate."
Functional
modification is less represented in the scoping review because this type of
sodium reduction research typically does not incorporate a sensory component as
a main assessment method, Dunteman notes.
If
consumers want to reduce their salt intake, the best strategy is to cook your
own food and limit your consumption of processed and packaged foods. You can
also wean yourself off salt with practice, essentially go on a "salt
diet."
"If
you're cooking at home, you can intentionally reduce salt and you'll appreciate
the reduced saltiness perception as time goes on. People can adjust to the
reduced salt level, but it's a learning and adapting process. You can also add
flavor enhancers such as herbs and spices," Lee suggests.
"If
you are a consumer of canned soup, for example, you can buy a low-sodium
version and add salt. Then you can gradually modify the amount of salt you add,
so you can make it palatable to your taste," she notes.
The research was supported by the Institute for the Advancement of Food and Nutrition Sciences (IAFNS) through an ILSI North America Sodium Committee grant. IAFNS is a non-profit science organization that pools funding from industry collaborators and advances science through the in-kind and financial contributions from public and private sector participants. IAFNS had no role in the design, analysis, interpretation, or presentation of the data and results.