Kathy:
100 g of mature milk has approximately :
3.8 g fat
1.0 g protein
7.0 g lactose
Taking into consideration the energy value of each, that means that
yes, fat contributes a little over 50% of energy. (See R. Lawrence's
chapter on "Biochemistry of human milk").
Grace S. Marquis, Ph.D.
University of Alabama at Birmingham