<qa>  What is the major long chain saturated fatty acid in human milk?Human milk is considered as the golden standard for infant formula. In human milk and infant formula lipids provide about 55 of energy for the infant and represent as such a major nutrient for the baby. The vast majority of the lipids in human milk is composed of triacylglycerols 98 of total lipids and the remainder percent are phospholipids. Triglycerides are composed of the glycerol backbone to which three fatty acids are bound. In human milk, palmitate 16:0 is the major long chain saturated fatty acid representing 22 to 26 of total fatty acids, esterified to approximately 70 in sn-2 position on the glycerol backbone. Unsaturated fatty acids such as oleic acid 18:1 and linoleic acid 18:2n-6 are preferentially esterified at the 1 and 3 position. In infant formulas the major source of palmitic acid is palm oil or palm olein where palmitate is, however, preferentially in the external 1,3 positions, and mono- and polyunsaturated fatty acids are usually esterified at the 2-position of the triacylgycerol. 