Specifically, it must be nutritious, easily digestible, and palatable. Siberian Musk deer have a preference for easily digestible nutritious foods. The soy carbohydrates in tempeh become more digestible as a result of the fermentation process. Starch can be classified as rapidly digestible, slowly digestible and resistant starch. Retrograded starch is less digestible (see resistant starch). Soy milk does not naturally contain significant amounts of digestible calcium. The starch is easily digestible and therefore well suited as a health and baby food. The omasum's main function is to absorb water and nutrients from the digestible feed. The meat is very lean, easily digestible, and "rich in proteins, minerals, and vitamins". Chicory is highly digestible for ruminants and has a low fiber concentration. Cooking partially breaks down food making it more easily digestible. A meal would ideally begin with easily digestible fruit, such as apples. In 2013 FAO proposed changing to Digestible Indispensable Amino Acid Score. They primarily eat the highly digestible blubber. Miller has been noted for his ability to summarize ideas into easily digestible soundbites.