There's a lot of anecdotal evidence out there that keto can cause brain fog. But is there any scientific proof?
Researchers looked at the effects of a ketogenic diet on brain function and found that while some people did experience a decrease in cognitive performance, it wasn't universal. In fact, some people actually experienced an improvement in their cognitive performance while on the keto diet.
So if you're experiencing brain fog on keto, don't worry – it's not necessarily indicative of a problem. But if you're concerned about it, talk to your doctor or nutritionist to see if there might be an underlying issue.