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Some studies conducted by some psychologists around the world claim that females found the sweat produced by males with a higher vegetable diet pleasant and attractive whereas some specialists counterclaim that eating vegetables, especially cruciferous vegetables give off a stinky body odor.
This claim relies heavily on a study conducted in Australia, which only sampled 45 participants – a small group –to assert that all men who eat vegetables smell better to all women all the time. In order to accept this claim as valid, more studies would need to be conducted and their results replicated.
Even though there are studies on the subject that can sway one's opinion, this is a very subjective question – what smells sweet to someone could smell rotten to someone else. Due to the subjectivity of this question, and after all the research, we decided the answer to this question is "possibly".
It is unclear exactly where and when the correlation between men eating vegetables more and being more attractive came from. The earliest reference was in the Washington Post in 1991. It mostly refenced how an older man kept his appearance young by constantly eating fruits and vegetables and keeping a healthy lifestyle. "Sexy" is not a standard that can be universally applied. Some may see facial hair as sexy, and others may not. It is all subjective.
Other instances where this was reported
The claim that eating more vegetables makes men appear sexier to women was most recently circulated in August of 2017. An article published in Food & Wine on August 14, 2017 was headlined "Men Who Eat Fruits and Vegetables Smell More Attractive." That article links to a NPR story from earlier the same day, "Men, Listen Up: Women Like The Smell Of Guys Who Eat A Certain Diet." The NPR story cites both the Australian study (Diet Quality and the Attractiveness of Male Body Odor) and a study published in 2006 (The Effect of Meat Consumption on Body Odor Attractiveness), which found that women preferred the odors of men with vegetarian diets that included the consumption of lots of eggs, soy, fruit, and vegetables. Both studies were published in reputable peer-reviewed scientific journals but sampled small numbers of people.
The week of August 14, 2017, other sources like The Cut, Huffington Post, delish.com, and the Sydney Morning Herald all highlighted the same claim from the Australian study.
This study then linked the intake of fat, meat, eggs, and tofu were linked to generally pleasant odors, while fruits and vegetables were linked to pleasant floral odors. A large amount of red meat however, led to a not as pleasant smell as white meat. From a biological standpoint, sweat is used to convey health status and prevent interbreeding. A sign of good health in birds and fish in high carotenoid levels. Carotenoids are a vitamin found in plant cell walls and are related to yellow pigmentation in skin, which this study found to be more attractive. A diet higher vegetables would then yield both a higher carotenoid level and are generally linked to a healthier life, which can both be linked to more pleasant anxiety sweat. Thus, a diet high in vegetables leads to more attractive/sexy smelling sweat.