There are servel resources availble to you. A quick internet search using your favorite search engine with the phrase "bariatric surgery before and after" yields several hits. Also, you can try to talking to your surgeon, who frequently takes pictures of past clients and may be able to show you some old pictures.
Your friend should go talk to her doctor about getting a bariatric surgery. You can find before and after pictures on this website. http://www.yourbariatricsurgeryguide.com/photo-gallery/
For pictures and diagrams on bariatric surgery, try this website: http://www.webmd.com/diet/weight-loss-surgery/gastric-bypass Also, I would recommend the book, Bariatric Surgery for Dummies. This book will tell you how bariatric procedures are performed.
Most doctors will not perform bariatric surgery unless you are obese. The pictures requested are available at: www.webmd.com/.../weight-loss-surgery/slideshow-weight-loss-surgery
Ask your doctor on your next visit for any information they can show you. Otherwise, check out WebMD for the weight loss surgery help center. The Consumer Guide to Bariatric Surgery also has before and after photos.
The best answer is that you just need to do a simple search of "before after bariatric pictures". There are literally hundreds of medical center / physician sites with the pictures you are looking for.
You can find information on bariatric before and after from your doctor's office. You can also find information online from sources such as "Your Bariatric Surgery Guide".
There are many places on the internet to find pictures of bariatric surgery. A few of those include: www.webmd.com/diet/...loss-surgery/slideshow-weight-loss-surgery, www.obeseinfo.com/before_after_gastric_bypass_surgery.htm, www.ebariatricsurgery.com/bariatricsurgerybeforeandafter.htm.
You doctor would be the best person to give you instructions on what to do before bariatric surgery, but you can find some more information here: http://www.yourbariatricsurgeryguide.com/surgery-before/
You can find information out about bariatric surgery, lapband surgery or the bariatric sleeve surgery here: http://www.yourbariatricsurgeryguide.com/cost/
You can find picture of people who have undergone the surgery on websites online, such as http://www.renewedreflections.com/forums/news-please-read/937-before-and-after-pics.html and http://www.obeseinfo.com/before_after_gastric_bypass_surgery.htm.
You can find information out about bariatric surgery, lapband surgery or the bariatric sleeve surgery here: http://www.yourbariatricsurgeryguide.com/cost/
I am not sure there will be a website that will provide pictures of bariatric surgery. You should consult your doctor about the possible risk and whether or not it is right for you.