This is what I understand to be true:
With RNY they bypass a certain length of your intestine. The more they bypass, the more extreme the malabsorption. There are four important aspects to this malabsorption:
1. Carbs. These are NOT malabsorbed. Every carb calorie you consume (other than fiber and maybe sugar alcohols) will land on your hips or belly if you don't use it up in the course of the day.
2. Fat. This is the biggie. If a normal person absorbs 100%, you might only absorb 70%. Your intestines will learn how to compensate for the bypassed part of the intestines, increasing your absorption, but you will always malabsorb a certain percentage. My guess because I don't have facts is that you will always malabsorb between 5 and 10% of fats.
3. Protein. This is also malabsorbed, perhaps at a similar rate as fat. This is a very essential nutrient, and it is important to get in Protein first always. If you have adequate protein your body won't steal energy from your muscles to function.... when you're losing weight you don't WANT to lose your muscles, they are what help you to metabolise and use all those calories. The fewer muscles or the less muscle mass you have, the fewer calories you burn and the harder it is to lose fat-weight.
4. Vitamins. You will always malabsorb vitamins. Make sure you take a multivitamin every day, a B-complex, B-12, and calcium citrate. A vitamin regimen of (imho) flintstones chewables and tums will result in several serious consequences: Osteoporosis as your body leeches calcium from your bones, pernicious anemia due to B-12 deficiency, Neuropathy due to thiamin and vitamin B deficiency, and even muscle spasms due to potassium deficiency. Take Your Vitamins.
The so-called Honeymoon period is the period of time when you eat the least amount of food, and you are the heaviest, so your body has to use the greatest amount of calories just to get you through every single day... since your calorie consumption is so far below your calorie needs you can possibly lose as much as 1 lb per day in teh beginning. As you lose weight your body requires fewer calories to function, and you eat more.... this continues to happen until at approximately 18 months the calories you can consume, even on your surgeon's plan with strict adherence, and the calories your body needs to function are even. If you have an enormous amount to lose, this could mean that you might level off at a weight in excess of what YOU want. This does NOT mean that that is all that you will ever lose. You are now more like a NORMAL person, in that if you want to lose more than the WLS will enable you to lose, you have to work at it just like the rest of the population. The tool will always be there to help you out and keep you on track, but ultimately this is not about a rearrangement of innards, it's about a re-training of bad habits during the period when we physically cannot eat like we used to. If you are successful at retraining your mind (and yes, we all slip up)... then you will be successful at keeping the majority of the weight off.
Now .... all that I wrote is based on what I've read on this site. In two weeks I'll find out how much my "book knowledge" meshes with a real-life experience.
~Lady Lithia~ 200 lbs lost!
March 9, 2011 - Coccygectomy!
I chased my dreams, and my dreams, they caught me!