I was diagnosed with chronic hypoglycemia over ten years ago, and have been living comfortably with it by taking control of my own diet. One thing I notice a LOT of people doing is mixing it up with diabetes or "hyperglycemia." When you have hypoglycemia, be it a chronic disease or a passing condition, that means you do not have enough sugar. Hypo = too low; glycemia = glucose status. For comparative purposes with Diabetes, I think it would help if I stated that the cause of my hypoglycemia has been termed a double-pancreas or a folded-pancreas, which means my doctors were trying to impress me with their knowledge of local ambiguous medical terminology, but my pancreas is always producing insulin in one way or another, which is what lowers the blood sugar. Diabetes is when you don't get enough insulin, so your blood sugar is high.
In easy terms, what this means is if you have Diabetes, you need to go low on foods that cause your blood glucose to rise. If you have Hyboglycemia, you should do pretty much the opposite, but ALWAYS eat it with foods that will KEEP your blood glucose up for several hours to avoid a sudden drop. Cookies? Sugar cookies even? Good! A whole bunch of sugar cookies, and that's all? You'll feel good for now, but it won't be long before your BG drops extremely rapidly, and you'll probably pass out on the floor. If you are hypoglycemic, don't eat diabetic food until you actually become diabetic.
It's worth pointing out that if you're prone to hypoglycemic attacks, this does not make you immune to hyperglycemic attacks, so don't just eat sugar cookies and cake and ice cream day in and day out. Aside from getting fat, this could result in hyperglycemia, which isn't any more fun than hypoglycemia. A healthy, balanced, well-scheduled diet is the best idea. Four smaller meals each day works best for me rather than three medium meals. This gets rid of the hour or two gap just before the next meal when my BG tends to drop too low.
Every human body, including those with similar medical conditions, is different. It's best to learn as much as you can about the condition, then ADAPT to your own body's needs (or in your case, the body of the person with the condition).
I just felt like posting this because I find it FAR too common for people to confuse hypoglycemia with diabetes and hyperglycemia. True, if you have diabetes, you can get hypoglycemic attacks, but the treatment is different (although you can still use glucose tablets in any case. Hey, now there's a great piece of advise for you!!!! I always keep a few tubes of glucose tablets around, and one on me at all times. They are great for avoiding an immanent hypoglycemic attack long enough for you to get some proper food. They are inexpensive, and I buy mine at Walmart. They can probably be found at many pharmacies for various prices under different names, but I like to save money since I don't have much to begin with.).
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Note: my spell checker quit on me in the middle of this post, so sorry if my spelling suddenly took a nose dive.