I have recently lost 25 lbs using Weight Watchers. I have changed my eating habits and I am eating more Fruits & Veg. I also have been exercising (Primarily walking everyday 30 - 40 minutes and riding my exercise bike as well). Recently while walking I have developed some mid level to lower back pain. I am wondering if it has anything to do with the weight loss that I accomplished over the last 12 weeks. Thanks for any help.