Why do feet smell like cheese

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Last updated: April 8, 2026

Quick Answer: Feet smell like cheese primarily due to bacterial breakdown of sweat, producing compounds similar to those in cheese. The human foot has approximately 250,000 sweat glands that can produce up to half a pint of sweat daily. Specific bacteria like Brevibacterium linens, which is also used in cheese-making, thrive in warm, moist environments and produce sulfur compounds and isovaleric acid. This creates odors reminiscent of Limburger cheese, which contains the same bacterial species.

Key Facts

Human feet contain about 250,000 sweat glands per foot
Feet can produce up to half a pint (236 ml) of sweat daily
Brevibacterium linens bacteria are found both on feet and in cheese-making
Isovaleric acid is a key compound produced by foot bacteria that smells like cheese
Foot odor typically becomes noticeable when bacteria populations exceed 1,000 per square centimeter

Overview

Foot odor resembling cheese has been documented since ancient times, with Roman poet Martial mentioning "cheesy feet" in his 1st-century AD epigrams. The phenomenon gained scientific attention in the 19th century when French chemist Michel Eugène Chevreul identified fatty acids in sweat in 1815. Modern understanding emerged in the 1950s when researchers discovered that specific bacteria, particularly Brevibacterium species, were responsible for both foot odor and cheese aromas. The connection became particularly notable with Limburger cheese, which has been produced since the 1830s in Belgium using the same bacteria found on human skin. Studies in the 1970s confirmed that over 90% of foot odor cases involve bacterial action rather than fungal infections, establishing the microbial basis for this common human experience.

How It Works

The cheese-like smell develops through a specific biochemical process involving sweat, bacteria, and environmental factors. When feet sweat, the approximately 250,000 sweat glands per foot release moisture containing salts, sugars, and amino acids. Bacteria like Brevibacterium linens, Staphylococcus epidermidis, and Micrococcus species metabolize these compounds through enzymatic breakdown. Brevibacterium linens produces methanethiol and dimethyl trisulfide, sulfur compounds also found in many cheeses. Simultaneously, bacteria convert leucine (an amino acid in sweat) into isovaleric acid, which has a distinctive cheesy aroma. This process accelerates in warm, moist conditions where bacterial populations can double every 20-30 minutes. The combination of these volatile organic compounds creates the characteristic odor that becomes detectable when bacterial density exceeds approximately 1,000 colony-forming units per square centimeter of skin.

Why It Matters

Understanding foot-cheese odor connections has practical applications in multiple fields. In medicine, it helps differentiate between normal bacterial activity and pathological conditions like pitted keratolysis, affecting treatment approaches for millions of people worldwide. The cosmetic industry applies this knowledge to develop effective deodorants and antimicrobial products, a market valued at over $2 billion annually. Food science benefits from studying these bacterial processes to control cheese ripening and flavor development. Additionally, research into foot odor has contributed to broader understanding of human microbiome interactions, with studies showing that individual bacterial compositions can predict odor profiles with 70-80% accuracy. This knowledge also informs hygiene practices, helping reduce social stigma associated with foot odor in workplaces and public settings.