Adding whole eggs to a colorful salad boosts the amount of Vitamin E the body absorbs from the vegetables, according to research from Purdue University.
"Vitamin E is the second-most under-consumed nutrient in the average American diet, which is problematic because this fat-soluble nutrient has antioxidant and anti-inflammatory properties," said Wayne Campbell, a professor of nutrition science. "Now consumers can easily improve their diets by adding eggs to a salad that boasts a variety of colorful vegetables."
Jung Eun Kim, a postdoctoral researcher in Purdue's Department of Nutrition Science, said, "We found Vitamin E absorption was 4- to 7-fold higher when three whole eggs were added to a salad. This study is novel because we measured the absorption of Vitamin E from real foods, rather than supplements, which contain mega-dose amounts of Vitamin E."
Vitamin E, which is absorbed along with dietary fats, is often found in oils, seeds and nuts. Eggs, a nutrient-rich food containing essential amino acids, unsaturated fatty acids and B vitamins, also contain a small amount of Vitamin E. This study accounted for how much total Vitamin E was absorbed when Vitamin E containing foods were co-consumed with whole eggs. This research supports a way to increase the absorption of Vitamin E found in foods that contain low dietary fat. Also, this research highlights how one food can improve the nutrition value of another food when they are consumed together.
The findings are published in The Journal of Nutrition, and the study was supported by the American Egg Board's Egg Nutrition Center, National Institutes of Health and Purdue Ingestive Behavior Research Center.
This research is an extension of a study that Campbell and Kim, along with Mario Ferruzzi, a professor at North Carolina State University, reported in June 2015 showing that by adding eggs to a salad there was an overall increased absorption of the vegetables' carotenoids. Both studies had 16 participants consume a raw mixed-vegetable salad with no eggs, a salad with one and a half eggs, and a salad with three eggs, 0 grams, 75 grams and 150 grams of eggs, respectively. All salads were served with three grams of canola oil, and the eggs were served scrambled to ensure the whole egg was consumed. In the 2015 study, the absorption of carotenoids -- including alpha-carotene, beta-carotene, lutein, zeaxanthin and lycopene -- was 3- to 8-fold higher when the salad included three eggs compared to no eggs.
Previous research conducted by Campbell and Ferruzzi also has shown that more carotenoids are absorbed when one larger salad is consumed at a meal, compared to smaller salads consumed at two meals during the day.
Campbell's research also focuses on understanding how dietary protein and exercise influence adult health as people age. He served as a member of the 2015 Dietary Guidelines for Advisory Committee.
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Kim, J. E., Ferruzzi, M. G., & Campbell, W. W. (2016). Egg Consumption Increases Vitamin E Absorption from Co-Consumed Raw Mixed Vegetables in Healthy Young Men. The Journal of Nutrition, jn236307.