The Zone diet, which is really popular, is 30% protein, 40% carbs, and 30% fat -- not too different from what you described. I've had days where I'm up to 60% fat, 20% protein, and 20% carbs (although those are rare). I just eat whole, unprocessed foods, and my health markers are all excellent. Personally, I think the SP recommendations for carbohydrates are a little high. If you feel good with your plan and it's something you can maintain, then by all means stick with it.
If you want an interesting alternative view to carbohydrates, check out Mark's Daily Apple at marksdailyapple.com and click on the link for the carbohydrate curve. It's all very well researched and offers a different view on the whole nutrition thing.
Hope that helps!
- 10/4/2011 8:33:01 AM