I'm not a huge chocolate lover, but I've dallied in it over the years mainly for its purported health benefits. However, it became a daily practice when I started following a ketogenic diet because the dark stuff (85%) is high-fat, low-carb. Pairing it with macadamia nuts is a nice, little fat bomb.
Turns out this stuff may have benefits in the gym. Researchers did a study where they divided mice up into four groups.
The mice that exercised and were given chocolate developed more capillaries and mitochondria in their leg muscles. When they put them to the test, these mice were able to run 50% further than the control group. And here's the kicker - the mice who ate chocolate and watched TV performed the same as the ones who exercised but didn't get chocolate.
It doesn't look like you need much in order to get the benefit. The amount given to the mice would be the equivalent of 5 grams for us non-rodents. I typically throw down 25 grams a day. That's about a quarter of a standard size bar. Remember... chocolate first, and then Crossfit.