I have been following the 5:2 plan for eating, and recently shed 2 pounds. Strange experience.. I had a great fast day on Friday.. Fast days are not really hard for me, when I'm at work. I stay so busy time goes by and cups of green tea or crystal light get me through until the one meal for diner. If I get hungry before that I eat a salad with a bit of protein. The strange part was the next day. Saturday is typically a shopping day for my daughter and I. We simply love the malls and shopping.. or just looking for things we'd like to buy. Recent trips have been to find a dress for a 50th wedding anniversary I am hosting for my favorite Aunt and Uncle. Normally I put on my sneakers (gym shoes) and can walk and walk and walk. I wear a pedometer daily my normal step count is about 5000 steps a day (I am an IT manager and typically sit at my desk most days) but on Saturdays I typically average 9000 steps easy with no problem. However this Saturday I was in pain, total agony after 5,000 steps. My knees were killing me!! I could not explain the reason for the pain. I had not felt like that since before the surgery in 2011 when I weighed 330 pounds. I've not had knee pain for over two years I'm not sure what caused that.. I can only attribute it to water retention in my knees. Still I will forge on. More determined than ever to get under 200 pounds. Making my goals 10 pounds at a time. .