low-fat buttermilk

Low-fat buttermilk is a liquid dairy byproduct traditionally made from the liquid remaining after butter has been churned from cream, though modern commercial low-fat buttermilk is typically produced by adding lactic acid cultures to low-fat milk. It is characterized by a tart, tangy flavor with a thin, pourable consistency and a slightly acidic taste profile. The lactic acid fermentation process lowers the pH, creating an acidity level of approximately 0.9% lactic acid, which distinguishes it from regular low-fat milk and imparts its distinctive sour notes.

Modern low-fat buttermilk contains approximately 0.5–1% fat by weight, significantly reduced from whole buttermilk or traditional cultured varieties, making it suitable for health-conscious cooking applications while retaining the functional and flavor properties essential for baking and cooking.

Low-fat buttermilk is extensively used in baking and cooking for both flavor and functionality. In baked goods—particularly biscuits, pancakes, waffles, cakes, and muffins—it reacts with baking soda to produce carbon dioxide, creating lift and a tender crumb structure. The acidity also activates leavening agents and tenderizes gluten strands, resulting in more delicate baked products. Beyond baking, low-fat buttermilk serves as the base for salad dressings, marinades for poultry and fish, and creamy sauces with reduced fat content. It is essential in Southern American cuisine and featured prominently in Irish and Northern European cooking traditions. Marinading meats in buttermilk yields more tender results due to enzymatic action.