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The value of gycaemic index is not difficult to grasp. It's an old idea that's been around for at least a couple of decades.
F 5 ft 3. HW: 196 lbs. Primal SW (May 2011): 182 lbs (42% BF)... W June '12: 160 lbs (29% BF) (UK size 12, US size 8). GW: ~24% BF - have ditched the scales til I fit into a pair of UK size 10 bootcut jeans. Currently aligning towards 'The Perfect Health Diet' having swapped some fat for potatoes.
I spent a lot of time in Asia and ate rice without a problem. I do prefer Basmati rice or Japanese sushi rice though as these are lower GI. I am active, and need a few extra carbs on days I work out, or I get the bonk (not got the hang of being fat adapted yet and spend too much time on my bike to go through it) so it's easy to cook a batch of sushi rice and make rice balls filled with salmon or tuna and veg or maki - good on the go pre-workout snack.
Back in older period of Japan, there was a disease called Beriberi. Basically a vitamin B deficiency brought about by eating white (polished) rice instead of brown (unpolished) rice. At the time, brown rice (being unpolished) was poor people food, so it wasn't something you ate regularly if you could avoid it.
If brown rice has much of these "anti-neutrients", whence solving this illness with brown rice?
I thought the primal approach toward starches is to use them in moderation and anyone with damaged metabolism, i.e. insulin resistant/diabetic, should proceed with caution, and include starches with other foods that slow the glucose rise in the blood. In other words eat rice or potato with fat like coconut oil or butter, and fiber like vegetables.
So white rice is an acceptable starch for some but it's not really primal (Mark Sisson has written about this a lot), and you only eat it if you need to replace glycogen and are athletic, or have issues with VLC or LC as I did.
Just FYI, the Perfect Health Diet includes what they call "safe starches" but with the warning I just mentioned. The authors say glucose from starch is needed for the body systems that make mucous and saliva. When I have gone VLC I got problems with dry mouth and a dry cough. I tried the Perfect Health Diet idea of adding safe starches and it fixed those problems, but then I stopped losing weight! You have to find the balance where those symptoms are alleviated; for those losing weight eating a little less fat will help.