Lipase is a type of enzyme that helps break down fats in our body. It plays an important role in digestion by breaking down the fats we eat into smaller molecules that our bodies can absorb and use for energy. Full definition
Identification and gene expression profile analysis of a major type of lipoprotein lipase in adult medaka Oryzias latipes (semanticscholar.org)
Depending on the level of lipase in your milk, this change in smell and / or taste may occur sooner or later. (breastfeedingtoday-llli.org)
Ottosson, K Vikman - Adolfsson, S Enerback, A Elander, P Bjorntorp and S Eden, Growth hormone inhibits lipoprotein lipase activity in human adipose tissue, Journal of Clinical Endocrinology & Metabolism, 2000, 80: 936 - 941, (hardgainermusclebuilding.com)