Why do smelly feet smell like smelly cheese?

Cheesy Feet

The quality of foot odour is often reported as a thick, cheesy smell. Some describe the smell like that of malt vinegar. However, it can also be ammonia-like.

Brevibacteria are considered a major cause of foot odour because they ingest dead skin on the feet and, in the process, convert amino acid methionine into methanethiol, which has a sulfuric aroma. The dead skin that fuels this process is especially common on the soles and between the toes.

The brevibacteria is also what gives cheeses such as Limburger, Bel Paese, Port du Salut, and Munster their characteristic pungency.

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