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REAL Eggs: Not all proteins are created equal
w h i t e p a p e r
Formulators and consumers alike are sorting out the facts about different protein types as it receives mounting media and public attention. With good reason — protein impacts overall nutrition and can contribute to everyday fitness. As an ingredient, the right protein also supplies both flavor and functionality. Egg ingredients can be the perfect protein choice.
American Egg Board
2 | American Egg Board
Long a favored nutrient of athletes and fitness
buffs, mainstream America is turning to protein
more than ever. Package labels point out for
consumers the protein content of products,
ranging from breakfast foods to desserts and
beverages. According to Mintel data, yogurt led
all other product types in 2014 for high-protein
package label claims, but cereal, pasta, packaged
vegetables and even ice cream also promote
protein content. Even fast food establishments
are jostling for the protein market share.1
Protein can be measured by two standards; its
nutritional quality and its functional properties.
Formulators must carefully consider the nutritional
aspect of a protein source as well as its functional
properties, as protein can be either beneficial or
detrimental to product shelf life, texture and taste.
One of the best, most reliable sources of a nutrient-dense, high-quality protein that also supplies beneficial functional properties is one of the most familiar — the egg.
Protein and Beyond
The six grams of high-quality protein that one
large egg supplies is just the beginning of an
egg’s nutritional story. At 70 calories, one large
egg provides 13 vitamins and minerals, including
the antioxidants lutein and zeaxanthin2 and
it’s one of the few food sources of vitamin D,
identified in 2010 by the Dietary Guidelines
Advisory Committee as a nutrient of concern.
This complement of vitamins and minerals
relative to its calorie count makes the egg a
nutrient-rich (nutrient-dense) food or ingredient.
Whether egg ingredients play a major or minor
role in product applications, the nutrient content
of each individual ingredient in a product can
impact the final label statement. Ingredients
must be selected carefully and with the final
label statement in mind.
The importance of proper ingredient selection
and application composition is highlighted
by the fact that today’s companies grapple
with the paradoxical dilemma of supplying
food to a consumer population that sometimes
struggle with a combination of food insecurity,
malnutrition and obesity.3 Various studies link
food insecurity with obesity. Consumers might
not be eating nutrient-dense foods that supply
a proper balance of vitamins and minerals.4, 5
High-quality protein, nutrient-rich ingredients
such as eggs can help create food products
that provide nutrition benefits for consumers.
With protein popularity at an all-time high,
and indicators pointing to a segment that
will continue to grow, companies can take
advantage of this window of opportunity.
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2XProtein 8g
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“REAL Eggs: Not all proteins are created equal” | 3
Protein’s Popularity
According to Mintel, the U.S. is the largest
market for high-protein products worldwide.6
For example just one product category,
high-protein bars, exhibited astonishing growth
with launches from 2012-2013 up 126.9 percent
over the previous year.
NPD Group data shows that 62 percent of
consumers make a conscious effort to consume
protein, yet 71 percent don’t know how much
their body requires.7 With a number of protein
sources and products available, there is sure
to be confusion about which is most effective.
Proteins Are Not Created Equal
Protein is a macronutrient, like fats and
carbohydrates, and provides a source of calories,
or energy for the body. Protein is found in every cell
in the body. It supplies energy, can boost satiety,
help prevent muscle loss in older adults, and can
aid athletes build muscle recovery time after
workouts. Amino acids, commonly referred to
as the “building blocks of protein,” perform much
of the work credited to protein. The amino acid
composition of a protein determines the quality
of different types of proteins.
Amino acids are classified as either essential
or nonessential. The body cannot produce
essential amino acids (EAA), identified as
histidine, isoleucine, leucine, lysine, methionine,
phenylalanine, threonine, tryptophan and valine,
so they must be obtained through the diet. The
protein in eggs is highly digestible and provides
much of the essential amino acids.
Because of eggs’ optimal EAA profile and high digestibility, they have traditionally been used as the gold standard for measuring protein quality.
In virtually every method used to evaluate protein
quality and digestibility, egg proteins consistently
rank highly with milk proteins.8
Satiety and Weight Management
Satiety and hunger management are key
components to controlling weight. Multiple scientific
studies provide evidence to support protein’s
benefits for increasing and maintaining weight loss
resulting from appetite regulations and energy
expenditure.9 A breakfast high in -protein —
specifically one that includes eggs — helps curb
hunger throughout the day. When dieters eat a
breakfast high in protein it can help promote greater
weight loss than a carbohydrate-based breakfast
that contains the same number of calories.10, 11
The biological value (BV) of a protein might
be a contributing factor in determining protein’s
effect on appetite. One study compared a cereal
breakfast to an egg breakfast. The cereal breakfast
scored a BV of 42, while eggs scored a BV of 100.
Study participants who ate the egg breakfast said
they felt more satiated. The egg group had lower
blood levels of ghrelin, a hormone that signals
4 | American Egg Board
hunger and significantly higher levels of PYY, a
hormone that signals fullness, compared to the
cereal group.12
Consuming breakfast has been associated with
better diet quality and greater nutrient intake,
compared to skipping breakfast,13 as well as a
possibly beneficial effect on appetite control and
satiety.14 Specifically, eggs as a breakfast food
have been found to be effective at increasing
satiety and reducing subsequent energy intake.15
Skipping breakfast, on the other hand, has been
linked to an increased risk of type 2 diabetes.16
However, some studies have found consuming
breakfast to have no significant effect on
weight.17,18 While consuming breakfast, especially
one that includes a high-quality protein, such as
that found in eggs, contributes to diet quality, more
research is needed to know if regular consumption
of the morning meal results in improved weight
management via appetite control.
Consumers are aware of the satiating effect of
protein. Within the International Food Information
Council 2014 Food & Health Survey, 91 percent
of consumers agree it is important to get enough
protein in the diet and 72 percent agree with the
statement ‘it helps people to feel full (satiety).’
Among those trying to consume protein, four out
of five get it from poultry, eggs, nuts, seeds and
fish, with 85 percent of that group selecting eggs
as one of their protein choices.19
Protein at Every Meal
Most Americans eat approximately three times
more protein at dinner than at breakfast. Studies
suggest, however, that, protein intake should be
spread out over the day, with 25-30 grams of high-
quality protein provided at each meal.
Consumers could benefit from dividing the daily protein intake more evenly between breakfast, lunch and dinner.
poultry
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40
50
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Protein’s Biological Value (BV)Top Efficiency
“REAL Eggs: Not all proteins are created equal” | 5
A recent study used a seven-day crossover
feeding designed to measure changes in muscle
protein synthesis related to meals with an evenly
spread protein intake compared to a diet that
skewed protein intake towards the evening meal.
The result was a 25 percent increase in muscle
protein synthesis in those consuming protein
evenly spread over meals. Overall, the authors
indicated, “Unlike fat or carbohydrates, the
human body has limited capacity to transiently
store ‘excess’ dietary protein from a single meal
to acutely stimulate muscle protein anabolism
at a later time.”20
Benefits of Protein-Rich Diets
Protein distribution and protein intake become
even more important with age. Decreased calorie
intake is common in older adults, and on average,
they consume fewer calories and less protein than
younger adults.21 In fact, under-nutrition can be
a complicating factor in elder care.22 In addition,
there is a direct correlation between protein intake
and muscle mass.
Sarcopenia is a progressive loss of muscle mass,
function, quality and strength related to the aging
process that affects23 an estimated 45 percent of
older adults in the United States. As the population
of adults age 60 and above continues to grow, with
global estimates that this group will triple by 2050,
including a large subset of individuals over the age
of 85,24 experts warn that sarcopenia will become
even more common. Loss of muscle mass leads to
diminished strength and can contribute to falls and
fractures, frailty and loss of physical function. After
age 70, muscle loss accelerates to approximately
15 percent per decade.25
Further complicating the issue, adults above age
60 exhibit anabolic resistance, which means they
do not respond to protein and exercise in the same
manner as younger adults.26 A combination
of increased protein plus exercise is critical for
proper muscle retention.27 In addition, researchers
note that formulators need to take into account
the sensory preferences of an aging population
related to loss of smell, taste and an increase
in dysphagia28 or trouble swallowing.
In a presentation delivered at an Institute of
Medicine Food Forum in Washington, D.C., in
2010, Jim Kirkwood of General Mills, “Formulating
for Aging Boomer Consumers,” identified several
key aspects of food formulating product developers
need to keep in mind. Under texture and appeal,
he said sensory consideration include “vibrancy,
potency and consistency.” Vibrancy relates to
appearance or mouthfeel. Potency refers to a “taste
profile that is the ‘sweet spot’ for older adults, given
that the sense of taste changes with ageing.” And
Consistency refers to the food’s texture and the
need to develop foods that are not, for example,
too crunchy or hard.”29 An egg contains high-
quality protein that is easily digestible, blends well
with a wide variety of flavors and depending on
preparation, can lend a texture that will meet the
sensory challenges of an aging population.
A high-protein diet also might help lower the risk for
developing high blood pressure. A study published
in the American Journal of Hypertension30 found
that participants consuming the highest amount
of protein (an average of 100 g protein/day) had
a 40 percent lower risk of developing high blood
pressure (HPB) compared to those consuming
the least. Further, the researchers found that adults
who consumed more protein, whether from animal
6 | American Egg Board
or plant sources, had significantly lower systolic
blood pressure and diastolic blood pressure levels
after four years of follow up.
Protein’s Practical Side
In addition to its nutritional benefits, egg protein
has a practical side. Proteins are available in
different forms and different proportions within
the white and the yolk, but both can contribute
valuable properties to formulations. The white
is the albumen, containing 56 percent of the total
protein in an egg. Yolks contain slightly less than
half the egg’s protein, vitamins and minerals, and
the lipid components.
The category of prepared meals has witnessed
an increase in the number of breakfast offerings,
with handheld sandwiches and breakfast bowls
gaining popularity and corresponding shelf space.
Preformed egg patties or egg scrambles are
an obvious choice for many of these applications
as a visible, primary protein, however egg
ingredients contribute more subtle benefits
in other prepared meals.
Nutrient Density
The concept of evaluating a food’s nutrient
density, especially in context with sustainability,
is relatively new. As one researcher noted,
“The American diet is said to be increasingly
energy-rich but nutrient-poor.” Yet, there is
a lack of consistent standards or criteria for
measuring nutrient density. One study said, “In
many cases, healthful foods are defined by the
absence of problematic ingredients — fat, sugar
and sodium — rather than by the presence of
any beneficial nutrients they might contain.”
A study published in 2014 compared the
energy and nutrient density of foods in relation
to their carbon footprint or greenhouse gas
(GHG) score.1 While sugar, sweets and grains
exhibited the lowest GHGs; these foods also
offered the lowest nutritional value. The most
nutrient-dense foods in the study had the
highest GHG scores, however, they offered
much higher nutritional value. Therefore, the
parameters used to measure a food’s value
related to its GHG score can vary widely
depending upon whether the criteria used was
a per weight basis, per energy or per nutrient
content. Animal-based proteins typically offer
a higher nutrient density than the plant-based
foods used in the study, including sugar, which,
on a weight basis, posts the lowest GHG score.
The authors recommended further study saying,
“Consideration of the environmental impact
of foods needs to be linked to concerns about
nutrient density and health.”
1. Drewnowski A, Rehm CD, Martin A, Verger EO, Voinnesson M, Imbert P. Energy and Nutrient Density of Foods in Relation to their Carbon Footprint. Am J Clin Nutr 2015;101:184–191.
of all restaurant breakfast selections consist of a sandwich 47%
“REAL Eggs: Not all proteins are created equal” | 7
Egg ingredients particularly egg proteins, positively impact mouthfeel and texture in prepared foods.
The egg white proteins’ coagulative properties
provide structure to noodles to help maintain
a desirable texture and bite when held in a liquid
or high-moisture frozen medium. Coagulation helps
bind other ingredients together. Egg proteins help
batters and breadings adhere to a substrate in an
appetizer application, or hold seeds, grains and
other decorative elements onto the outside
of breads and rolls, for example.
Egg ingredients, primarily lipids, form emulsions
consisting of very fine droplets, which help sauces
maintain a pleasant mouthfeel. The right selection
of egg ingredient for a sauce application will help
it maintain appearance, texture and viscosity
under high-heat — desirable attributes in a product
designed for microwave heating.
Confections and Frozen Foods
Proteins from egg whites help control crystallization
in select confections and frozen foods. Crystallization
impacts food quality and mouthfeel by lending a
gritty texture to a substance that is supposed to
be smooth and creamy. Many confections involve
a super-saturated solution of sugar and water.
While saturation is desired, if it occurs too quickly,
crystallization will result. Egg white introduced as
an interfering agent slows the process of saturation,
forming finer crystals for a smooth, creamy texture.
In ice cream, egg yolk disperses fat throughout
the ice cream mix to prevent it from clumping.
Eggs aid in whipping properties to help achieve
desired overrun. And the combination of protein
and fat present in eggs can help prevent the
aggregation of crystal-forming compounds.
Baking with Eggs
Many baked goods owe their appearance, texture,
taste and part of their shelf life to egg ingredients.
Staling occurs when swollen starch chains lose
water content. Egg white proteins help trap extra
water and lend greater strength to the baking
structure. In formulations that use whole egg, the
yolk’s lecithin, a lipid, lodges in the space between
the highly branched starch chain to help hold water
and extend shelf life.
Egg white is comprised of conalbumin, globulins,
ovalbumin and ovomucin; proteins which enable
egg whites to create the largest food foams
possible from a natural source — six to eight
times greater in volume than the original liquid.
Ovalbumin and ovomucin are primarily responsible
for the formation, volume and structure of egg
white foam. When heat is applied during baking,
the proteins in the foam form a reinforced network
that strengthens the baked good and enables it
to maintain volume. Time, temperature and other
variables can affect egg white foam stability.
Incredibly Flexible
The impressive list of functional benefits supplied
by egg ingredients becomes even more incredible
in light of the fact that eggs are a natural food.
Whether including eggs in formulation for their
8 | American Egg Board
nutritional contribution or their functional attributes,
formulators can simply list them as “eggs” on
the label. This is important as the push for more
transparent, clean labeling intensifies. While
companies are shying away from use of the word
“natural,” consumers are increasingly interested
in simple labels with natural ingredients. In fact,
more than one research group has identified a
shift from clean to “clear” labeling as a dominant
industry trend, with clear focusing more on
transparency within the supply chain and corporate
sustainability practices.
In addition to the consumer trend for greater label
transparency, other eating habits or preferences
growing in popularity include flexitarianism and
vegetarianism. Flexitarians are identified as those
who have decided to include more vegetables
in their diet and cut back on meat, not eliminate
it. The vast majority of vegetarians who have
eliminated meat will accept eggs as a viable
protein option. Eggs can supply a valuable source
of high-quality protein for vegetarian or flexitarian
meals. According to Mintel, 12 percent of global
new product launches in 2013 were labeled
“vegetarian.” Yet, despite the popularity of protein,
less than one percent of food and drink products
launched globally carried both a “vegetarian” and
“high-protein” claim.31
There will always be special market segments that
can benefit from the protein eggs offer. Gluten free
is predicted to grow through 2018 and eggs supply
functionality in addition to supplementing protein
lost when wheat flour is replaced with gluten-free
alternatives. While eggs in the shell are naturally
gluten free and are not a genetically modified
(GM), or bioengineered food, formulators should
check with their egg suppliers about the GM status
of other ingredients that are sometimes added
to egg products to enhance functionality.
Egg ingredients offer flexibility to manufacturers
who are able to select from dried, liquid or
frozen versions of whole eggs, egg yolk or egg
white, depending on processing parameters and
functional requirements. For example, applications
such as breakfast sandwiches or bowls can use
prepared egg products that have been scrambled,
boiled, or formed into patties.
Flexibility is the word to describe the 20+ functional
properties eggs supply to applications ranging
from appetizers through dessert, with those
functional benefits available from the protein
and/or the lipid content.
In a world with various protein options, REAL Eggs prove that all proteins are not created equal.
REAL Eggs are a readily available, domestically
produced, sustainable, nutrient-rich, functional
source of protein to fulfill nutritional and
processing needs.
20+functionalproperties
Citations
1. Taco Bell. http://www.tacobell.com/Company/newsreleases/new-power-platform_2014 (Accessed March 17, 2015)
2. U.S. Department of Agriculture, Agricultural Research Service. 2014. USDA National Nutrient Database for Standard Reference, release 27 Nutrient Data Laboratory Home Page, http://www.ars.usda.gov/ba/bhnrc/ndl
3. Gundersen C. Food insecurity is an ongoing national concern. Adv Nutr 2013;4:36-41.
4. IOM (Institute of Medicine). Hunger and Obesity: Understanding a Food Insecurity Paradigm: Workshop Summary. Washington, DC: The National Academies Press. 2011.
5. Larson NI, Story MT. Food insecurity and weight status among U.S. children and families: a review of the literature. Amer J Prev Med 2011;40:166-173.
6. Mintel. U.S. Consumers Have a Healthy Appetite for High Protein Food. http://www.mintel.com/press-centre/food-and-drink/us-consumers-have-a-healthy-appetite-for-high-protein-food-the-us-leads-the-way-in-global-launches-of-high-protein-products (Accessed March 17, 2015)
7. NPD Group. Consumers Want More protein but Many Don’t Know Recommended Daily Amount Needed. https://www.npd.com/wps/portal/npd/us/news/press-releases/consumers-want-more-protein-but-many-dont-know-recommended-daily-amount-needed (Accessed March 17, 2015)
8. Layman DK, Rodriguez NR. Egg protein as a source of power, strength, and energy. Nutr Today 2009;44:43-48.
9. Bendtsen LQ, Lorenzen JK, Bendsen NT, Rasmusssen C, Astrup A. Effect of dairy proteins on appetite, energy expenditure, body weight, and composition: a review of the 2012;28:1151-1156.
10. Rains TM, Leidy HJ, Sanoshy KD, Lawless AL, Maki KC. A randomized, controlled, crossover trial to assess the acute appetitive and metabolic effects of sausage and egg-based convenience breakfast meals in overweight premenopausal women. Nutr J 2-15:14:17.
11. Vander Wal JS, Gupta A, Khosla P, Dhurandhar NV. Egg breakfast enhances weight loss. Int J Obes 2008;32:1545-1551.
12. Dhurandhar NV. Breakfast containing egg proteins induces greater satiety compared to a breakfast with lower protein quality. European Congress on Obesity 2012. Lyon, France. May 12, 2012.
13. O’Neil CE, Nicklas TA, Fulgoni VL 3rd. Nutrient intake, diet quality and weight/adiposity parameters in breakfast patterns compared with no breakfast in adults: National Health and Nutrition Examination Survey 2001-2008. J Acad Nutr Diet 2014;114(supplement):S27-S43.
14. Leidy HJ, Ortinau LC, Douglas SM, Hoertel HA. Beneficial effects of a higher-protein breakfast on the appetitive, hormonal, and neural signals controlling energy intake regulation in overweight/obese, “breakfast-skipping,” late-adolescent girls. Am J Clin Nutr 2013;97:677-88.
15. Fallaize R, Wilson L, Gray J, Morgan LM, Griffin BA. Variation in the effect of three different breakfast meals on subjective satiety and subsequent intake of energy at lunch and evening meal. Eur J Nutr 2013;52:1353-1359.
16. Bi H, Gan Y, Yang C, Chen Y, Tong X, Lu Z. Breakfast skipping and the risk of type 2 diabetes: a meta-analysis of observational studies. Public Health Nutr 2015; Feb 17:1-7 [Epub ahead of print]
17. Dhurandhar EJ, Dawson J, Alcorn A, Larsen LH, Thomas EA, Cardel M, Bourland AC, Astrup A, St-Onge MP, Hill JO, Apovian CM, Shikany JM, Allison DB. The effectiveness of breakfast recommendations on weight loss: a randomized controlled trial. Am J Clin Nutr. 2014;100(2):507-513.
18. McCrory MA. Meal skipping and variables related to energy balance in adults: a brief review, with emphasis on the breakfast meal. Physiol Behav 2014;134:51-54.
19. International Food Information Council. International Food Information Council Foundation 2014 Food & Health Survey. The Pulse of America’s Diet: From Beliefs to Behaviors. ww.foodinsight.org/sites/default/files/2014%20Food%20and%20Health%20Survey%20Full%20Report.pdf (Accessed March 17, 2015)
20. Mamerow MM, Mettler JA, English KL, Casperson SL, Arentson-Lantz E, Sheffield-Moore N, Layman DK, Paddon-Jones D. Dietary protein distribution positively influences 24-h muscle protein synthesis in healthy adults. J Nutr 2014; 144:876-880.
21. Paddon-Jones D, Rasmussen BB. Dietary protein recommendations and the prevention of sarcopenia. Curr Opin Clin Nutr Metab Care 2009;12:86-90.
22. Schilp J, Kruizenga HM, Wijnhoven HA, Leistra E, Evers AM, van Binsbergen JJ, Deeg DJ, Visser M. High prevalence of undernutrition in Dutch community-dwelling older individuals. Nutrition 2012;28:1151-1156.
23. Paddon-Jones D, Short KR, Campbell WW, Volpi E, Wolfe RR. Role of dietary protein in the sarcopenia of aging. Am J Clin Nutr 2008;87:1526S-1566S.
24. World Health Organization. Ageing. http://www.who.int/topics/ageing (Accessed February 24, 2015)
25. Nutrition’s Role in Sarcopenia Prevention. By Becky Dorner, RD, LD, and Mary Ellen Posthauer, RD, LD, CD. Today’s Dietitian (14) No. 9, 62.
26. Moore DR, Churchward-Venne TA, Witard O, Breen L, Burd NA, Tipton KD, Phillips SM. Protein ingestion to stimulate myofibrillar protein synthesis requires greater relative protein intakes in healthy older versus younger men. J Gerontol A Biol Sci Med Sci 2015;70:57-62.
27. Churchward-Venne TA, Breen L, Phillips SM. Alterations in human muscle protein metabolism with aging: Protein and exercise as countermeasures to offset sarcopenia. Biofactors 2014;40:199-205.
28. Sura L, Madhavan A, Carnaby G, Crary MA. Dysphagia in the elderly: management and nutritional considerations. Clin Interv Aging 2012; 7:287-298.
29. Institute of Medicine (US) Food Forum. Providing Healthy and Safe Foods As We Age: Workshop Summary. Washington (DC): National Academies Press (US); 2010.
30. Buendia JR, Bradlee ML, Singer MR, Moore LL. Diets higher in protein predict lower high blood pressure risk in Framingham offspring study adults. Am J Hypertens, 2015; 28:372-379.
31. Mintel. Numbers of global vegetarian food and drink product launches double between 2009 and 2013. http://www.mintel.com/press-centre/food-and-drink/number-of-global-vegetarian-food-and-drink-product-launches-doubles-between-2009-and-2013 (Accessed February 24, 2015)
“REAL Eggs: Not all proteins are created equal” | 9
10 | American Egg Board
Additional White Papers from AEBThe American Egg Board is committed to providing the food processing industry with the most recent and up-to-date information as it relates to consumer trends and scientific information used in the development of applications where eggs play a role. Much has been written on the unique and irreplaceable benefits of eggs in applications such as baked goods, sauces and dressings and prepared foods. We invite you to download our other white papers:
The Egg and Clean Labeling
The American Egg Board studies the effects of The Egg and Clean Labeling,
focusing on the relevance and importance of eggs in today’s clean label
marketplace and their power to enhance and protect your food...
Download our Clean Label white paper at AEB.org/RealEggs
REAL Eggs are GMO-Free
The good news for food formulators is that according to USDA, eggs are not
a genetically modified (GM), or bionengineered food. This applies both to shell
eggs and the eggs used for further processed products. We explore the science…
Download our GMO-Free white paper at AEB.org/GMO-Free
Gluten-Free Solutions Begin with REAL Eggs
The right ingredients create delicious gluten-free foods with great texture, taste
and appearance; and compliant with FDA regulations for this product category.
REAL Eggs are gluten-free and provide a stellar functional profile…
Download our Gluten-Free white paper at AEB.org/GlutenFree
The Egg and Sustainability
‛The Egg and Sustainability’ white paper summarizes a 50-year landmark study of
the environmental impact of the U.S. Egg Industry. Improved production practices
have led to healthier hens and lower resource use…
Download our Sustainability white paper at AEB.org/Sustainability
“REAL Eggs: Not all proteins are created equal” | 11
NOTES:
American Egg Board
American Egg BoardP.O. Box 738
Park Ridge, IL 60068
Phone: 847.296.7043
Fax: 847.296.7007
AEB.org
© 2015 American Egg Board
About the American Egg Board (AEB)AEB connects America’s egg farmers with those interested about
The incredible edible egg™. For more information, visit AEB.org/RealEggs.
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