The Jaminets' Perfect Health Diet recommends 400 calories from carbs a day. They also say that, for the purpose of calculating carb intake under their diet, only calories from tubers and other 'safe starches' like white rice should count as being carb calories. Carbs from other vegetables don't count - you can eat as much as you like as far as they're concerned.
I eat a lot of root vegetables (carrots, beetroot, parsnip, swedes etc) which are fairly high in carbs. So if I eat 400 carb calories of sweet potatoes a day, plus my usual helping of root vegetables, I can't help but feel this would push me over what the Jaminets would consider an optimal about of carbohydrates, despite what they say. Is my concern unfounded or not?
I'm especially thinking about how root vegetables carbs affect the ketogenic version of their diet (which involves 200 carb calories rather than the usual 400). Surely being carefree with root vegetables will significantly undermine ketosis?
UPDATE 1: If vegetable carb calories do count to some extent, then I'm very interested in whether, on the normal non-ketogenic version of the Perfect Health Diet, I can get all of my PHD-prescribed daily 400 carb calories from root vegetables, and ignore tubers and white rice altogether?
UPDATE 2: I found some relevant figures on http://lowcarbdiets.about.com which I thought might be helpful to others viewing this question. Here's the amount of effective (net) carbohydrates you get from 1/2 cup of different veg: Sweet potato (cooked): 18g Potatoes (raw): 12g Parsnip (raw): 9g Butternut squash (raw): 7g Beetroot (cooked): 6g Onion (raw): 6g Rutabage/swede (raw): 4g Carrot (raw): 4g Kale (cooked): 2g