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It's all about that 3 dimensional molecular shape to our bodies! I mean not sure why you put "double-bond" in quotes, are you upset that I did not specify carbon carbon double bond?

Double bonds make a portion of the carbon chain very rigid, they would be like putting tape around the junction between two paper clips in your chain. The rest of the chain can move around freely but where you have taped together (the double bond) you have lost that flexibility.

I was mentioning about this issue. Thanks for ur feedback though! 🖐