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Humans and other animals are mostly incapable of synthesizing carotenoids, and must obtain them through their diet. Carotenoids are a common and often ornamental feature in animals. For example, the pink color of salmon, and the red coloring of cooked lobsters and scales of the yellow morph of common wall lizards are due to carotenoids.
From there they are transported in the plasma into the peripheral tissues. Carotenoids are eliminated via sweat, sebum, urine, and gastrointestinal secretions. [citation needed] Carotenoids contribute to normal-appearing human skin color, and are a significant component of physiologic ultraviolet photoprotection. [4]
They also (in lower concentrations) impart the yellow coloration to milk-fat and butter. Omnivorous animal species which are relatively poor converters of coloured dietary carotenoids to colourless retinoids, such as humans and chickens, have yellow-coloured body fat, as a result of the carotenoid retention from the vegetable portion of their diet.
For example, lycopene can be found in most human body tissues but preferably accumulated in the liver, adrenal glands and male reproductive system. [28] [29] Another carotenoid, lutein is also found in different organs but it is one of the most preferred carotenoids of the brain and its retina and of the ovaries. [30] [31]
It all has to do with those protective carotenoids: When you eat too many carrots, you can develop a condition called carotenemia, which can cause your skin to turn an orange or yellow hue. This ...
Vitamin A occurs as two principal forms in foods: A) retinoids, found in animal-sourced foods, either as retinol or bound to a fatty acid to become a retinyl ester, and B) the carotenoids α-carotene (alpha-carotene), β-carotene, γ-carotene (gamma-carotene), and the xanthophyll beta-cryptoxanthin (all of which contain β-ionone rings) that ...
Carotenoids — aka pigments found in colorful fruits and vegetables — are linked to better vision, ... per a separate 2024 study published in the journal Nature Human Behaviour. In order to use ...
Distribution of macular pigment constituent carotenoids presented in scale onto a photograph of a healthy human retina. Meso-zeaxanthin, lutein, and 3R,3′R-zeaxanthin are the main carotenoids in the macula lutea, found in a ratio of 1:1:1, and are collectively referred to as macular pigment (MP). [3]