Bariatric Surgery: Postoperative Concerns
The above post has a link to the article with the same title. It's a PDF file, so I suggest you download, print it out, and keep it in your file.
A bit about post op hypoglycemia. This take place basically because your pouch is small. It happens not only to gastric bypass for weight loss post ops, but to other people who have had gastric surgery for such things as cancer and refractory ulcers that ended in perforations.
The how/why of the works is like this.
Since you have a small pouch, your food doesn't get the chance for it to be all mixed up and crunched up the way it is with a normal stomach. Also, the amount you eat is much smaller. So, the food passes through to the area that it is absorbed--the intestines--faster than the normal stomach. With the normal stomach, the mixed up food takes time (because of the total amount) in passing through, and also a lot of the digestive juices are mixed up in the stomach, so the harder to digest proteins and fats are already in a much easier state to absorb than with a pouch, where almost none of such juices are mixed up. This all makes for the carbs/sugars to be passed into the blood stream much faster, and in a lump, than with the normal stomach. Add to this, with the loss of extra weight, iinsulin resistance will improve, so there is *more* insluin to do the job of working on the absorbed glucose and get it out of the blood stream. This will make it easier for dumping to take place. Since you say your father gets hypoglycemic, you probably have a genetic tendency for overacting pancreas (where insulin is produced) that leads to overproduction of insulin in reaction to glucose in your blood stream. Before you lost weight, this didn't show up because of the amount you ate and the normal absorbtion, and because of insulin resistance. Now that the two big factors that prevented the symptoms from becoming apparent (overt) have gone, you are getting frequent symptoms.
One way to prevent this is to get your protein in first, or to eat carb type foods that also has protein, like peanut chocolates--not that I mean you can eat chocolates, but as an example. Choosing wholesome carbs instead of refined carbs should also help ease the problem. Never take carb foods without protein or fat. (A little bit of fat won't do you harm, as the total amount you can eat is much much less than before.)
Anyway, one of the reasons you are instructed to get protein in first, other than because you need a specific amount of protein daily and your pouch is small, is also to prevent hypoglycemia which is much more likelier to happen if you take carbs by itself.
If juice doesn't work for you, what about a glass of milk with 2-5grams of glucose added to it?
Any info on low blood sugar 
So long as you are putting your best foot forward, then, 
****Hazel**** 
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