Anecdotally, when I'm on a very-low-carb diet (and in confirmed mild ketosis), mosquitoes seem less interested in me.
There was a study back in 2009 suggesting higher ketone levels in sweat act as a natural mosquito repellant, but that state could be changing microbiome balance/chemistry, too – so there are multiple possible mechanisms.
There was a study back in 2009 suggesting higher ketone levels in sweat act as a natural mosquito repellant, but that state could be changing microbiome balance/chemistry, too – so there are multiple possible mechanisms.