While not as harmful as wheat, barley, or rye, remember that rice is still a grain. White rice is allowed because the antinutrients are in the hull and they have been stripped off.
In this case you're proposing to eat the hull. While there are useful things in there, there are also the very antinutrients that we're trying to avoid. For example it contains trypsin inhibitors which prevent you from digesting protein. In other words, not paleo.
You can get your Mg from coffee and dark chocolate and leafy greens, and while soaking and fermenting will disable some of the antinutrients, why go through all that trouble just to eat an inferior food? And you can be sure that brown rice products (i.e. crap in a bag disguising itself as healthy) aren't going to be soaked and fermented.
Why not eat a sweet potato, or a bison ribeye, some bacon rashers with a couple of ounces of liver pate instead?
Technically not paleo as raydawg points out… not paleo primarily because 1) rice is a grain; 2) rice is a starch; 3) rice has anti-nutrients such as phytates.
Addressing each point:
So… brown rice is not paleo by definition, but if you're looking for a healthy food, it fits that definition. And now the paleo dogmatics will downvote me for suggesting such blasphemy.
I was diagnosed earlier this year with a Gluten allergy. Brown rice is the only thing I can have in moderation. I did a 30 day detox diet to cleanse my body of all toxins from the processed foods I'd been eating. After losing 15 pounds during this 30 day detox, I wanted to continue eating natural foods. I decided on the Paleo Diet and have continued to lose weight rapidly. I guess I confused my gluten allergy with the Paleo Diet, which rice is considered Non-Paleo . Thank you for all your encouraging replies!!! I will will continue to eat Paleo, using my 20% wisely and in moderation.
Like others that have commented here, it depends on how "hardcore," you want to be. Back in the earlier days of paleo, the answer would have been a resounding no, but things have changed. People like Paul Jaminet have argued that rice is a safe starch, but only if it is white rice. And of course, the obvious problem there is that it has no nutrients. For me, an endurance athlete, white rice is like a gift from the Gods because I often just need calories that are easily digested. However, some people in the periphery of the paleo movement, such as Stephan Guyenet have argued that most people would probably benefit from taking the time to soak brown rice… by benefit he means, is your diet really on point enough to not need the added nutrients? As for brown rice products, obviously for things like brown rice pasta you would not have the option of soaking it… but really, if you want to eat brown rice pasta, just do it!
Depends how seriously or hard core you are taking it. Technically, you can't eat brown rice at all because it is a grain. But people do because they'd go out of their mind if they had none, especially when they start out. So I guess, if you are going to be miserable without it, eat it, and someday, consider giving it up, and finding other tasty stuff to eat instead of it.