Oat gums are the water-soluble polysaccharides extracted from oat grain, consisting chiefly of mixed-linkage (1→3)(1→4)-beta-D-glucans, the same fibres behind oat’s viscosity and heart-health claims. Food makers use them as natural thickeners that build smooth, creamy body in soups, sauces, beverages, and dairy alternatives without starch’s pasty notes. Their power depends on molecular weight: aggressive processing or beta-glucanase enzymes shorten chains and weaken both thickening and physiological effect, so manufacturers specify viscosity grades. Extraction and drying must preserve the long chains, making gentle process control the key to a functional gum.