The following Mark's Daily Apple article was written by Mark Sisson, and is narrated by Tina Lehman.

CrossFit's criticism, how do I eat enough carbs on primal?

By far, the single most common criticism levied against paleo by crossfitters

is that it's too damn difficult to eat enough carbs to maintain performance during workouts.

There's definitely truth there.

First, let's establish something.

Do crossfitters indeed need more carbs than your average primal bear? Yes, crossfit workouts are intense.

Your muscles need fuel to support intense movements, and they need it immediately and repeatedly.

Glycogen just works better for that. It's a matter of logistics. Glycogen just works better for that.

It's a matter of logistics.

Glycogen is right there in the muscle, ready to go.

It's settled, sedentary, tethered.

The fatty acids we burn are unencumbered, nomadic, going where they're needed.

That's why we call them free fatty acids.

Furthermore, glycogen requires less oxygen to burn than fat.

As your average cross-foot workout has you out of breath within the first minute or two,

glycogen is a crossfitter's best friend.

A 2016 study was a unique one because they took actual crossfitters following a moderate low carb

diet, around 200-ish grams per day, and separated them into two groups. One group stayed moderate

low. The other bumped their intake up to 400 to 500 plus grams per day. Both maintained

normal three-on-one-off CrossFit training schedules. They gave performance

tests before and after the diet shift, with as many rounds as possible in 12 minutes of 12 box

...