I used to play poker online a few years back. Playing good poker demands total concentration and quite a bit of knowledge. You need to be a lot sharper than the average opponent.
Some people still claim that the brain needs a lot of carbs every day, otherwise it will shut down (funny, I know). They also think that low carb diets make people depressed, tired, sleepy and slows the thought processes. Some even believe diets high in fat shrink the brain!
According to these wild (and mostly disproven) ideas it should be impossible to have an intellectual career on low carb. For example playing poker professionally.
This turns out to be false. I was contacted by a successful poker pro who’ve been eating LCHF for a while. His experience is the opposite of what some think. He experiences increased mental performance, especially by being able to focus for a long time.
When I linked to this on my Swedish blog some commentors noted that LCHF diets were actually pretty popular in people discussing poker online. For the same reason: More durable mental focus.