Yes and no, in that I'm a pescetarian...although my meals tend to be less fish and more Quorn these days, so pretty much 90% vegetarian. Haven't had any problems, to be honest, with weight loss. To be honest I tend to stick to standard cookbook recipes, but swap out the meat for Quorn...for example, I made a Morroccan stew the other day, and the recipe called for lamb. I added the new Quorn lamb-style pieces instead, and it came out yum. Also has the added bonus then of having lower pp than the meat version, so a good idea for everyone really imo.