How will Ketones help the Brain during crossfit workouts

Cliff Harvey Phd has been using the keto diet and ketones In his practice since 1998. He has worked with the top athletes in Australia and NZ and every health condition imaginable.
In this Video Series we discuss the use of Ketones for various benefits within Crossfit.
Q: Is it gonna help a crossfit athlete? And how is that going to keep them more focused during workout and what's the benefit?

A: I think neurofatigue is a massive thing and so there are a lot of aspects to that. Simple one is if we don't necessarily have enough fuel and some of us don't fuel our brains as well as we could. Especially when you suffer concussions, traumatic brain injuries and all those stuff. Your glucose transport can be impaired as well. A lot of lifestyle factors can be of __ transport of the brain as well. Basically anything that can supply fuel to the brain that's not glucose or not sugar is gonna be a good thing and really the only thing you got is ketones because nothing else really crosses the blood brain barrier well apart from some short of medium chains fit. Typically within the body it's basically just ketones that are gonna cross the blood brain barrier to supply that fuel to neurons. It can be critically important for workouts. Often that is the mind that's failing before the body. One thing that I definitely want to mention here is a number of crossfit athletes has talked to me about the idea of just getting more in because a recreational crossfit athlete will get great results from all these things we've been talking about and they can possibly get very good results from being on a very low carb diet as well because they're not necessarily doing a huge volume of training although it's very intense. Let's say you're an average crossfit athlete doing 3 or 4 sessions a week, while that's very intense work that total volume and the total amount of your glycogen stores isn't actually that high. But compare that to an elite crossfit athlete who might be doing 2 or 3 sessions a day, to get into the modalities that they need particularly before a big event. They've got a demand on all of the fuel systems. It's not like they're gonna exhaust fat off their body, but they definitely want to be very brief fed at that day. They also want to have very good glycogen stores if they're doing multiple sessions over a day because they will be deflating that as well. But they can also get benefit from ketones as a direct fuel but also onto stirring that glycogen. A lot of tough athletes has talked to me about basically using ketones as a way just to get more fuel so they can have that triple fuelling effect from baseline fat oxidation through turning glycogen through to having ketones as well. This is a really interesting thing because a lot of my athletes is starting to actually have a small amount of carbohydrates with the ketones but for purely for a fuelling purpose and it works amazingly, despite the fact that some people will say you should never have carbohydrates with ketones. That doesn't actually make any sense.