I was on a liquid diet for 2 weeks prior to surgery and 2 weeks post-op. I had my surgery on 14 April. I had a little less energy during the pre-op diet than normal, but was able to work and do all my normal activities. Post-op has been quite a bit different. The 1st week after surgery, I was really tired. This is a pretty significant surgery though, so it your body has to recover. I was released from the hospital on 16 April, and by 19 April I was on the treadmill. There are days it's tough to find it in you to jump on there, but I haven't missed a day. I'm up to an hour a day, and the exercise is making all the difference in the world. I returned to work yesterday, so I was pretty worn out when I got home. Resting for an hour, then jumped on the treadmill for an hour. Talked to my Doc about the energy levels on Monday at my 1st follow-up. He said it's quite normal to not have much energy and is to be expected. He said it varies from person to person, but can be from a month to 3 or 4 months until you get back to your normal energy level. From there, it so go up as you lose weight.