Answer:
Since 1929, when Burr and Burr first described a syndrome caused by stringent fat reduction in a diet (which manifested mostly as cutaneous symptoms, such as erythema with scaling, hair loss, itch, and increased water loss), it became clear that particular fat pay an essential role in skin structure [1,2]. The word “essential” best describes these fats because of the inability of the human organism to synthesize them, which means they can only be provided through dietary intake. The term essential fatty acids (EFAs) was formed and referred to two polyunsaturated fatty acids (PUFAs), linoleic acid (LA) and α-linolenic acid (ALA), initiating acids for the cascade of elongation to very long-chain PUFAs (more than 22 C-atoms). PUFAs are divided into two families, omega-3 (ω-3) and omega-6 (ω-6). ω-3 fatty acids (FAs) have in common a terminal carbon-carbon double bond in the omega three-position, the third bond from the methyl end of the acid, whereas, ω-6 acids have it in the omega six-position, the sixth bond from the methyl end of the fatty acid, respectively.
Step-by-step explanation: