welcome to the forum. I wouldnt be too concerned that U have screwed up your metabolism too bad...I have yoyo dieted for 25 yrs and I have done great with low-carbing. It sounds like U are doing well...congrats on the weight loss. I would suggest U stay low carbing and give up the slim fast. If U have a period of time where U arent losing weight or inches then adjust your diet [ by adding a few more carbs for a few days then cutting back again] increasing your water intake and exercise. Hope that helps.