skim milk or milk substitute

Skim milk is bovine milk from which the fat content has been mechanically removed or largely reduced, typically containing less than 0.5% milk fat by volume compared to whole milk's 3.5-4%. The milk is produced through centrifugal separation, a process that spins whole milk to separate the denser skim milk from the lighter cream layer. The result is a watery, opaque white liquid with a mild dairy flavor and slightly sweet taste. Nutritionally, skim milk retains most of the protein, lactose, and water-soluble vitamins of whole milk, including calcium and vitamin D when fortified. Milk substitutes—plant-based alternatives such as soy, almond, oat, coconut, and rice milk—are non-dairy liquids formulated to approximate whole milk's nutritional profile and functional properties in cooking. These alternatives are typically produced by extracting liquid from plant sources and fortifying with added vitamins, minerals, and thickeners to improve texture and nutritional content.

Skim milk is used extensively in baking, cooking, and beverage applications where fat content is reduced for dietary or health reasons. It features in coffee and tea, is consumed directly as a beverage, and is incorporated into sauces, soups, custards, and cooked cereal preparations. While skim milk produces less creamy mouthfeel than whole milk, it can be used in most applications where whole milk appears. Milk substitutes serve similar culinary functions: soy milk works well in baking and savory dishes due to its protein content; oat milk provides creaminess suited to coffee and sauces; almond and coconut milks are popular in beverages and desserts; rice milk works in baking and cooking but may require thickeners. Substitutes cannot always directly replace dairy milk 1:1, particularly in applications requiring milk's emulsifying or protein-setting properties.