Loren Cordain says we shouldn't eat them because they contain toxins. He says only sweet potatoes are acceptable. I love sweet potatoes so I eat only them just to be on the safe side, but I'm not sure potatoes should really be avoided. Aren't all the toxins destroyed by cooking? Many pre-agricultural societies eat cassava, which is also toxic when raw. But I'm avoiding potatoes for now.
BTW sweet potatoes (actually boniatos) don't interfere with my weight loss at all. They are not like sugar and flour.
Height: 5'4" (1.62 m)
Starting weight (09/2009): 200 lb (90.6 kg)
No longer overweight (08/2010): 145 lb (65.6 kg)
Current weight (01/2012): 127 lb (57.5 kg)