I have in the past and now I just incorporate the SB's ideas of using non-processed foods and decreasing my portion size i.e., when the hunger subsides I stop eating(surprising how we continue eating when we really aren't "hungry" anymore--but it's hard when the food tastes so darn good!), which I'm not sure I needed SB to help me with.
The first 2 weeks are not the best, it's not uncommon to feel sluggish, cranky, and to have headaches. I tried to run during it and my legs felt like lead. You're eating decent portions but your body really does notice the lack of even fruit for those first 2 weeks. I will tell you this--I don't do it anymore per se, it does teach you about "healthier" ways of eating(no processed foods, etc.,). BUT, since I've decreased my portions(a "regular" size meal if that makes any sense), increased the veggies and fruits and increased my water or non-sugar drinks(crystal lite for example)and most importantly to me--upped the exercise--(I was slacking) I've lost about 5-6 pounds but more importantly to me, inches. Let's face it, the SB ricotta desserts aren't all that.
The bottom line is, burn more calories than you eat. I do like their recipes for the "meals" but some of the desserts, like the ricotta thing just weren't my style. You have to find what works for you, and the SB diet has gotten a lot of good press. If you are exercising though, you may want to move ahead to Phase 2.
Hope this helps!
