甚麼是飽和脂肪和不飽和脂肪?

(1) Saturated fat is composed of saturated fatty acids whereas unsaturated fat is composed of unsaturated fatty acids which contain C=C double bonds in the fatty acid molecules.

(2) We cannot say "carbon的變化". Carbon atom is carbon atom. The difference is just the way they bond to one another.

(3) "反式脂肪" is trans- fatty acid in English term. When there is a C=C in the fatty acid long chain, it could be either in cis- form or in trans- isomeric form. Therefore, there is no trans- fat when we are talking about saturated fat. When we talk about trans- fat, we are referring to unsaturated fats.

By the way, unsaturated fats have lower melting points in general.

我唔明＠＠