Chicken eggs are an important food source for human nutrition.

On the intake of chicken eggs as regards its impact on human health, in recent decades, there are conflicting views.

Doubts focus on the cholesterol content and its potential role in cardio-metabolic outcomes.

A whole or boiled chicken egg contains about 15 micrograms of selenium and in addition iron, Vitamin B₂, B₁₂, D, E

It also contains lutein, a carotenoid that can be protective against diseases such as age-related macular degeneration (1) and choline, a cellular and nervous restructurer and anti-inflammatory.(2)

Recent studies have also shown that the egg, due to its vitamin D content, helps protect the eyes from cataracts and other degenerative diseases due to ageing.

On the other hand, health recommendations indicate that dietary cholesterol should be limited to less than 200 mg per day; a single large egg yolk contains about 275 mg of cholesterol (3), so taking even a single egg increases LDL cholesterol.

 The consumption of whole egg in the middle-aged and elderly population has long been discussed in the scientific literature.  The impact on the cardiovascular system with possibility of disease has been under observation for several years. However, this study considers that the intake of whole egg does not affect the risk of cardiovascular disease (4).

This study, on the other hand, considers that a high consumption of eggs is significantly associated with a higher risk of contracting incidental cardiovascular diseases (5).

Egg studies

References_________________________________________________________________________

(1) Chung HY, Rasmussen HM, Johnson EJ. Lutein bioavailability is higher from lutein-enriched eggs than from supplements and spinach in men. J Nutr. 2004 Aug;134(8):1887-93. 2004. 

(2) Zeisel SH. Choline: critical role during fetal development and dietary requirements in adults. Annu Rev Nutr. 2006;26:229-50. 2006. 

(3) Dietary cholesterol and egg yolks: not for patients at risk of vascular disease.  Spence JD, Jenkins DJ, Davignon J.  Can J Cardiol. 2010 Nov;26(9):e336-9.

(4) Impact of whole egg intake on blood pressure, lipids and lipoproteins in middle-aged and older population: A systematic review and meta-analysis of randomized controlled trials.  Wang MX, Wong CH, Kim JE.  Nutr Metab Cardiovasc Dis. 2019 Jul;29(7):653-664. doi: 10.1016/j.numecd.2019.04.004.

(5) Associations of Dietary Cholesterol or Egg Consumption With Incident Cardiovascular Disease and Mortality.  Zhong VW, Van Horn L, Cornelis MC, Wilkins JT, Ning H, Carnethon MR, Greenland P, Mentz RJ, Tucker KL, Zhao L, Norwood AF, Lloyd-Jones DM, Allen NB.  JAMA. 2019 Mar 19;321(11):1081-1095. doi: 10.1001/jama.2019.1572.