There are two parts in an egg.
Egg white: The outer white part is called egg white or Albumen. Egg white contains two parts, outer thin layer and inner think layer.
Egg yolk: Inner yellow part is called egg yolk. Egg yolk and egg white are separated by thin membrane layer called the vitelline membrane. Within the egg yolk, the central circle is called the germ. This is the place where chick develops if the egg is fertilized.
Proteins
Proteins ovalbumin (nourishment), ovotransferrin (protein binds to iron), ovomucoid (blocks digestive enzymes), globulins (repair membranes), lysozyme (digest bacterial cell walls), ovomucin (inhibit virus) and avidin (binds to vitamin biotin)
Amino acids
Tryptophan, Isoleucine, Leucine, Lysine, Methionine, Cystine, Phenylalanine, Tyrosine, Valine, Arginine, Histidine, Alanine, Aspartic acid, Glutamic acid, Glycine, Proline, Serine
Vitamins
Vitamin B-6, Pantothenic acid, Thiamin, Riboflavin, Vitamin B-12, Vitamin C, Betaine, Choline, Folate
Minerals
Calcium, Iron, Magnesium, phosphorus, sodium, zinc, copper manganese and selenium
Water, carbohydrates, very small amount of fat (no cholesterol)
Ref: http://www.nal.usda.gov/fnic/foodcomp/search/index.html
Egg yolk contains the nutrients present in egg white along with Vitamin A, D, E, K and cholesterol.
Ref: http://www.nal.usda.gov/fnic/foodcomp/search/index.html
Egg white contains approximately 20 calories. There is no cholesterol in egg white.
Egg yolk contains approximately 60 calories. There is 30mg cholesterol in egg yolk.
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Eggs are rich source of proteins, amino acids, vitamins and minerals.
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Proteins and amino acids are important for cells and genetic make up
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Eggs are good source of various B vitamins. B complex vitamins provide several health benefits (Go to vitamins section for details).
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It contains carotenoids mainly lutein and zeaxanthin. These protect eyes and prevent macular degeneration
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Egg contains choline, a water soluble nutrient important for the regulation and function of nervous system. Choline also improves heart function
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Egg contains vitamin D. Vitamin D is required for strengthening the bones.
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Sulfur contents present in the egg in the form of amino acid helps for healthy hair and nails.
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Eating egg white reduces cholesterol and weight.
Egg yolk contains cholesterol. High blood cholesterol is one of the underlying causes of overweight and heart diseases. Some may show allergic reactions to eggs due to its protein content. In case you observe any reaction, consult your doctor immediately.
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Chicken is s good source of proteins, amino acids, vitamins and minerals with rich source of tryptophan (amino acid) and vitamin B3 (niacin), pyridoxine (B6), selenium and phosphorus.
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Chicken is a good source of protein. Proteins and amino acids are important for cell growth, function and genetic make up.
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Chicken is a good source of vitamin B, niacin and mineral, selenium. Both involve in the prevention of cancer.
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Chicken protein also protects bone loss in elderly people
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Protects against alzheimers disease
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Vitamin B niacin protects heart and heart diseases
Eating too much fat containing chicken can lead to obesity and heart problems.
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