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  MAY 22, 2018 by NATASHA LONGO
Can Egg Consumption Improve Bone Strength?

Researchers at the University of Georgia sought to establish if eating eggs can improve bone strength and cognitive function in obese and normal weight children.

Nutritionist Dr Carrie Ruxton has successfully challenged studies vilifying egg yolks as a contributor to coronary artery disease. It's also relevant to recognize that eggs are much healthier today than they once were. The reason eggs have become more nutritious over the past decade is that hens are no longer fed bone meal, which was banned in the Nineties following the BSE crisis. Instead the birds are normally given a mixture of high-protein formulated feed, which makes their eggs more wholesome.

Additionally, because eggs contain a high concentration of choline--a precursor of acetylcholine that crosses the blood-brain barrier--the scientists want to determine if egg consumption improves attention and memory in children.

"The protein and bioactive compounds in eggs, such as lutein and zeaxanthin, are thought to be advantageous to bone mineralization in children during growth," said Richard Lewis, UGA Foundation Professor in the department of foods and nutrition and principal investigator of the study. "This project will be interesting because it is a nine-month feeding study in children, and so we felt the need to explore the possibility of creating food products that children may like over the long term to prevent burnout."

Eggs are rich in vitamins B6 and B5. These help balance hormone levels and fight stress, two things that are crucial to a healthy libido and lowering cardiovascular risks. Eggs are also a symbol of fertility and rebirth yet many still perceive them as an "evil food" due to misconceptions and misinformation regarding their nutrients. The fact is, eggs have every vitamin known (expect C) making them one of the few and exceptional foods in this category.

For the first and recently-completed phase of the study, UGA's FoodPIC developed several food products with whole eggs, including eggy pancakes, macaroni and cheese and ice cream, for children to consume during the nine-month feeding trial.

With a total of 180 participants, the second phase of the study will split the children into three distinct groups. One group will consume 10 egg products per week for nine months, while the other two control groups will consume either whole milk-based products or gelatin.

"We should have a pretty good model to answer the question about how egg intake influences bone and cognition," said Lewis, who also serves as director of UGA's Bone and Body Composition Lab. "If eggs are superior to milk, then maybe there are some unique bioactive compounds in eggs beyond just the protein."

In addition to enhancing skeletal growth and muscle development, several compounds in eggs, such as lutein, zeaxanthin and choline, may also improve memory and cognitive function. By using software developed by the National Institutes of Health, the UGA researchers can assess whether egg consumption has an effect on children's brain health.

"I think it's important to mention that it's biologically plausible for egg consumption to act on brain nerves and improve cognitive functions in kids whose brains are developing," said Patrick O'Connor, a professor in the COE's department of kinesiology and a co-principal investigator on the project. "The kinds of things we'll measure include the children's working memory and ability to sustain attention and how quickly they can respond to these tests. We'll know if they're performing well, poorly or in an average way compared to other kids in the U.S. of the same age and sex."

Various cognitive tests and evaluations will be conducted with NIH-developed software presented to the children on an iPad. By comparing the test results with age-based norms before and after the feeding trial, the study will determine whether egg consumption improves memory and mental control.

"There's certain aspects of health that we don't necessarily or normally relate to cognition," Lewis said. "So, I think the two aspects of the study, the skeletal growth development and the cognition, will really make a nice contribution to pediatric literature."

While bone and brain function are rarely studied together, obesity--a global epidemic--has been shown to diminish both bone and brain health due to chronic inflammation. Through blood tests and a variety of imaging tests conducted on equipment in the BBCL, including a dual energy X-ray absorptiometry scanner and peripheral quantitative computed tomography, UGA researchers will measure participants' bone mineral density and body composition.

"This will be an important study because there are only a few nutrition bone trials that have been conducted with the time needed to detect changes in bones, which is about nine months," Lewis said. "The cognition part will make an important contribution as well."

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