Hi, Clifton:
I lost over 30 pounds in the six months prior to my surgery, mostly due to the steady loss of 'taste' (from the AN pressing on the 7th nerve - that controls taste) and subsequent loss of appetite. Fortunately, although not a large person, I was able to shed the pounds safely, although I was probably at the bottom end of my 'normal' weight range. 14 months later and I've only gained about 5 pounds back...and I eat whatever I want, to my dieting wife's chagrin. My PCP said this sometimes happens after major surgery...something about hormones being 're-arranged' and affecting the metabolic rate. Because I was relatively slender all my life and only started gaining weight - and a 'gut' - after I was in my 50's, my newfound flat stomach is much welcomed and I'm determined to keep it!
Unfortunately, I can't claim any of my experience will apply to you. You'll probably lose
some weight while in the hospital, but not that much. However, you asked about 'dramatic' weight gain/loss before or after AN surgery , so I thought I would offer my experience, even if it may not have a lot of relevance for you. Losing weight isn't usually easy but if you lose any in the hospital, use that as motivation to keep going until you reach your healthy, desired weight. Cut out junk food and definitely eat smaller portions. I do, and this has helped to keep the weight off.
You have our prayers for your upcoming surgery on September 14th.
Jim