I love the science between BOTH and their writings and research. but lets face it. Everyone responds different. I know some people that have to suffer and go very low in kcals to get Period. They cant lose weight on 2000 calories and have to go to protein and veggie meals some days and then refeed to keep their metabolism going and to get shredded. And some people like Layne, Tommy, Doug Miller can diet on 200g of carbs and get shredded and win pro-cards. So i think this just boils down to individual and what is necessary to reach that desired level of leanness. We are all different, but at the end of the day some people do need to get drastic the last few weeks to really get into the shape they desire. Now... for people that do hours of cardio and eat 800 calories for a Month-2-3 months period of time. That may be a problem.... Especially what low kcals can do to your t3, leptin, hormone levels.