Eggs, one of the most commonly consumed breakfast foods in the United States, have long been a subject of controversy. Are they healthy or are they a high-cholesterol trap? The answer depends on what the hen eats, says a Tel Aviv University researcher.
Dr. Niva Shapira of Tel Aviv University's School of Health Professions says that all eggs are not created equal. Her research indicates that when hens are fed with a diet low in omega-6 fatty acids from a young age — feed high in wheat, barley, and milo and lower in soy, maize and sunflower, safflower, and maize oils — they produce eggs that may cause less oxidative damage to human health. That's a major part of what determines the physiological impact of the end product on your table.
Her findings were published in the Journal of Agricultural and Food Chemistry.
Cholesterol oxidation: an industry standard?
Eggs high in omega-6 fatty acids heighten cholesterol's tendency to oxidize, which forms dangerous plaque in our arteries. Dr. Shapira's research shows that eggs laid by hens with healthier feed can lessen oxidation of LDL (low density lipoprotein), the body's "bad cholesterol."
But healthier eggs are likely to cost more, Dr. Shapira says. The price of chicken feed varies from region to region, and in many areas, feed containing products high in omega-6 fatty acids, such as maize, soy, and their oils, are much cheaper for egg producers to purchase.
To test the effect of a healthier feed on the eventual composition of the egg, Dr. Shapira and her fellow researchers designed feeds that were high in anti-oxidants and lower in omega-6 fatty acids, based on wheat, barley, and milo. The specialized feed was given to young hens who had not yet accumulated n-6 fatty acids in their tissues, and the composition of their eggs was then tested. When researchers achieved the desired composition of low omega-6 and high anti-oxidants, the eggs were given to test participants, who were instructed to eat two of these special eggs daily. Their results were measured against daily intake of two standard grocery store eggs, and a weekly intake of only two to four standard eggs.
There were vast differences in outcome among the treatments. Daily consumption of two industry-standard eggs, high in omega-6, caused a 40 percent increase in LDL oxidizability in participants. After eating two per day of the specially-composed eggs, with both high anti-oxidant and low omega-6 levels, however, LDL oxidation levels were similar to the control group eating only two to four eggs a week.
Surprisingly, with the "healthier" eggs, we might be able to eat more than twice today's generally recommended egg intake and still maintain a healthy level of LDL oxidation, Dr. Shapira concludes.
Demanding a better product
The drawback is that these eggs aren't being widely produced. For now, consumers can only buy what the grocery store stocks.
Dr. Shapira recommends that consumers demand "health-oriented agriculture." "In addition to factoring in the cost of the chicken feed, farmers need to think about the health of the consumer," she says. To produce healthy foods, they need support from local authorities and increased consumer awareness. That would help to expand access to better foods.
As her study demonstrates, consumers should beware of egg studies that draw a single conclusion about the health value of all eggs, Dr. Shapira cautions, because the outcome could have a lot to do with how the egg was produced. In Europe, corn and soy are less commonly used in chicken feed, whereas in North America, these two ingredients often make up the bulk of the hen's diet.
George Hunka | EurekAlert!
Europe’s Demographic Future. Where the Regions Are Heading after a Decade of Crises
10.08.2017 | Berlin-Institut für Bevölkerung und Entwicklung
Scientists reveal source of human heartbeat in 3-D
07.08.2017 | University of Manchester
Whether you call it effervescent, fizzy, or sparkling, carbonated water is making a comeback as a beverage. Aside from quenching thirst, researchers at the University of Illinois at Urbana-Champaign have discovered a new use for these "bubbly" concoctions that will have major impact on the manufacturer of the world's thinnest, flattest, and one most useful materials -- graphene.
As graphene's popularity grows as an advanced "wonder" material, the speed and quality at which it can be manufactured will be paramount. With that in mind,...
Physicists at the University of Bonn have managed to create optical hollows and more complex patterns into which the light of a Bose-Einstein condensate flows. The creation of such highly low-loss structures for light is a prerequisite for complex light circuits, such as for quantum information processing for a new generation of computers. The researchers are now presenting their results in the journal Nature Photonics.
Light particles (photons) occur as tiny, indivisible portions. Many thousands of these light portions can be merged to form a single super-photon if they are...
For the first time, scientists have shown that circular RNA is linked to brain function. When a RNA molecule called Cdr1as was deleted from the genome of mice, the animals had problems filtering out unnecessary information – like patients suffering from neuropsychiatric disorders.
While hundreds of circular RNAs (circRNAs) are abundant in mammalian brains, one big question has remained unanswered: What are they actually good for? In the...
An experimental small satellite has successfully collected and delivered data on a key measurement for predicting changes in Earth's climate.
The Radiometer Assessment using Vertically Aligned Nanotubes (RAVAN) CubeSat was launched into low-Earth orbit on Nov. 11, 2016, in order to test new...
A study led by scientists of the Max Planck Institute for the Structure and Dynamics of Matter (MPSD) at the Center for Free-Electron Laser Science in Hamburg presents evidence of the coexistence of superconductivity and “charge-density-waves” in compounds of the poorly-studied family of bismuthates. This observation opens up new perspectives for a deeper understanding of the phenomenon of high-temperature superconductivity, a topic which is at the core of condensed matter research since more than 30 years. The paper by Nicoletti et al has been published in the PNAS.
Since the beginning of the 20th century, superconductivity had been observed in some metals at temperatures only a few degrees above the absolute zero (minus...
16.08.2017 | Event News
04.08.2017 | Event News
26.07.2017 | Event News
18.08.2017 | Life Sciences
18.08.2017 | Physics and Astronomy
18.08.2017 | Materials Sciences