Does Garlic or Red Meat Make Body Odor Worse?The Smell Tests

Underarm odor comes from skin bacteria working on sweat.¹ Food lists add to that: garlic, onions and alcohol are said to make sweat smell worse.¹ Researchers at Charles University in Prague tested some of these claims the direct way, with cotton pads and noses.

The smell tests

Study	Who gave the samples	What changed	What the raters said
Red meat, 2006	17 men, each eating a meat diet for 2 weeks and a no-meat diet for 2 weeks2	Pads worn for the last 24 hours of each diet, rated by 30 women2	No-meat odor was more pleasant, more attractive and less intense2
Garlic, 2016	42 men across 3 studies, with and without garlic, a week apart3	Raw garlic in two studies, capsules in one; pads worn 12 hours; rated by 82 women3	Low dose: no difference. Higher dose and capsules: more pleasant or more attractive, less intense3
Fasting, 2019	Healthy women, after 48 hours on water only4	Pads worn 12 hours before, during and after the fast; rated by men4	Fasting: no difference. After eating again: more pleasant4

Each person served as their own comparison, which is the strength of these designs.²³ The weaknesses: small groups, mostly men as the donors, and no chemical measurements of what changed.²³

What this means for you

• Garlic is the surprise. In these tests it didn’t make underarms smell worse, and at higher doses raters liked the smell better.³ Garlic breath is a separate matter; the studies didn’t test it.
• Red meat had the clearest effect, in one study of 17 men.² Whether women’s odor changes the same way wasn’t tested.
• Fasting to “detox” didn’t help. Two days without food left women’s odor unchanged.⁴

If you suspect a food, test it on yourself: note the meal, then rate your odor the next day for a couple of weeks. A food earns a cut only if the pattern repeats. For everyday fixes, see why you still smell after showering and antiperspirant vs deodorant.

When it’s not about food

Some smells point inside the body. A fruity odor can be a sign of diabetes, a bleach-like odor can come with liver or kidney disease, and any sudden change in odor or sweating is worth a visit.¹ A fishy odor has its own testing path: see trimethylaminuria.

Try: “My body odor has changed over the last two months and I haven’t changed my diet or products. What could cause that, and should we run any tests?”

Arms Up covers this in Chapter 8, “Still Smell After a Shower?,” in a section called “What You Eat (Matters Less Than You’d Think).” Its Fresh Log has a line each day for food, alcohol and medicine next to whether a zone was wet, smelly or both. The book suggests checking the underarm of the shirt you took off that evening instead of sniffing yourself, so a food you suspect has to show up, again and again, before you give it up. See the book.