Egg yolk nutritional benefits

Egg yolk function

What is an egg yolk?

An egg yolk is the round part which is inside the egg.

Sometimes, we can find two or more eggs yolks inside an egg. This is due to the youth of the laying hen that has a lack of synchronization in its ovulation.

Eggs containing more than one yolk are also edible, without risk to consumer health.

Egg yolk has a slimy texture in its raw state, it is easily separable from the egg white through a membrane called vitelline membrane that covers and protects it. As it happens with the egg white, if cooking is too long, it hardens.

Egg yolk represents about 30 % of the whole egg.

Why an egg yolk is yellow or orange?

Because it contains xanthophylls (Lutein and zeaxanthin), that give the yellow or orange colour to egg yolk. This part of the egg can vary depending on the animal feed, cooking or treatment to which the egg is subjected to. For example, if we exceed the cooking time, it can develop a grayish color.

What is the function of the egg yolk within an egg?

It is to provide food to the embryo

What is there in the egg yolk?

Egg photoRaw egg with the yolk surrounded by the egg white

Egg yolk contains various nutrients. The main ones are the following:

What is egg yolk used for?

Apart from eating it fried or boiled. It is often used as the main ingredient of omelettes, alone or in combination with vegetables or meat.

It can also be present in various culinary preparations as sauces in some fat combination, such as ” aioli ” or as an ingredient in many desserts, such as cakes or pastry creams.


Egg yolk is rich in antioxidants

Egg yolk is rich in antioxidants, particularly lutein and zeaxanthin. Numerous studies have demonstrated the role of these two components in the prevention of eye diseases, especially in regard to the loss of vision because of macular degeneration and night blindness.

In addition to these two components, we must not forget that egg yolk is among the richest foods in vitamin A, one vitamin that is considered a good antioxidant. Lack of vitamin A, among other things, is responsible for numerous eye problems such as night blindness, lack of vision, dry eyes, lack of tearing, redness, etc..

Egg yolk is rich in vitamin B

Egg yolk contains abundant vitamins of B group, especially choline. Choline is responsible for the formation of the neurotransmitter acetylcholine.

Acetylcholine is necessary for the proper functioning of nerve impulses in the brain. Having choline deficiencies may cause imbalances in the brain that are manifested in the form of inappropriate behavior, emotional problems and lack of memory.

Choline is also very interesting in pregnancy to maintain the health of the fetus. High folic acid content contributes to this aspect, too.

No less important are other B vitamins, especially riboflavin and pantothenic acid , acting as important as food metabolism, nerve health, immune system and the health of hair, nails and skin.

Egg yolk is rich in vitamin D

Egg yolk is among the richest foods in vitamin D. This vitamin allows calcium absorption, thereby contributing to a good maintenance of teeth and bones. It is also important to keep arteries in good condition, for nerve health and the proper functioning of the heart and digestive system.

Vitamin D in egg yolk makes egg very interesting for ovo-vegetarian people, that’s to say, vegetarians who include eggs in their diet, since there is virtually no vitamin D in other foods of plant origin

*Related information:

Egg yolk properties

Egg shell

Eggshell properties

Eggshell decoration

Egg white

punto rojoMore information about eggs.

This article was endorsed by Elisenda Carballido - Dietitian nutritionist. Postgraduate in Phytotherapy and master in Nutrition and Metabolism.
Written by Editorial Botanical-online team in charge of content writing

23 October, 2022

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