<P> The quality of foot odor is often described as being thick and resembling that of cheese, malt vinegar, or ammonia . </P> <P> Brevibacteria are considered a major cause of foot odor because they ingest dead skin on the feet and, in the process, convert the amino acid methionine into methanethiol, a colorless gas with a distinctive sulfuric aroma . The dead skin that fuels this process is especially common on the sole and between the toes . Brevibacteria also give such cheeses as Limburger, Bel Paese, Port Salut, Pálpusztai and Munster their characteristic pungency . </P> <P> Propionic acid (propanoic acid), a breakdown product of Propionibacteria amino acid metabolism in adolescent and adult sebaceous gland ducts, is also present in many foot sweat samples . The similarity between the chemical structures of propionic acid and acetic acid may account for the tendency of foot odors to be identified as smelling like vinegar . </P> <P> Isovaleric acid (3 - methyl butanoic acid), another other source of foot odor, is produced by Staphylococcus epidermidis, a bacterial species normally resident on human skin and present in several strong - smelling varieties of cheese . </P>

Why do my feet always smell like vinegar
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