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While we have to get them from our diet and if they aren't taken in our diet we will face disease.Then why we don't have the enzymes which are require for EFA synthesis???

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It's not really like your body can decide like 'hey, lets synthesize the enzyme required to catalyze the reaction for the creation of this EFA'. Apparently, we're just fine without them due to ample EFAs in our diet. –  pbond Jul 20 at 18:08
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Have a look at this topic: biology.stackexchange.com/questions/16962/… –  Chris Jul 20 at 18:25
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i don't understand will u plzz elaborate it more –  Haya Dar Jul 20 at 19:22
    
I would speculate that since essential fatty acids are so abundant in our diet, there was no selective pressure for the maintenance in our genome of the enzymes that produce them. –  canadianer Jul 20 at 20:36
    
@canadianer can you add more details if you can and post your comment as answer –  WYSIWYG Nov 26 at 13:02

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