Well, let's see...
My own personal study (more than 10 years of actively pursuing weight loss through low-fat & Ornish-type diets) tells me this...
While starving myself on plain baked potatoes & other carb loaded foods, I actually gained weight. Now I am a Type II diabetic.
At my internal specialists urging, I began Atkins, immediately started losing weight and have recently been able to cut the dosage for my diabetes medication in half.
The unexpected bonus - I no longer suffer from insomnia or migraines.
I wonder how many of PCRM's "safe, healthy" diets yield the same results.