Why does the state of ketosis from low-carb dieting help hypoglycemics?

Following the USDA government food pyramid guidelines, the hypoglycemic is using glucose (blood sugar) as his primary fuel. After a meal containing carbohydrate, there is an insulin spike draining the blood of glucose (blood sugar). The brain is temporarily starved of fuel with the consequential side-effects of disorientation, fatigue, and inability to concentrate. The body does not yet know who to use ketones for fuel (the body wouldn't turn on that mechanism for a couple of days yet) so the body craves carbs to re-fuel it. So the hypoglycemic eats again and starts the process all over again.

In a low-carb, ketosis state, the mechanism is different. The hypoglycemic eats a high protein, high fat meal and does NOT get an insulin spike. The glucose level is maintained because the body is not using glucose for fuel but ketones from fat for fuel. Any small amount of carbs that are eaten maintain the current glucose level without causing an insulin spike. There is no longer a massive, immediate glucose conversion that leaves the blood depleted of glucose and leaves the brain starved. The brain simply continues to use the ever-present ketones for fuel.

However, there is some controversy as to whether the ketones fuel the brain as efficiently as glucose. Some people say that on a low carb diet, they have a little forgetfulness and inability to concentrate all the time, but I can testify not to the same degree as caused by low blood sugar after a high carb meal.

Also, it should be noted that insulin spikes and high levels of insulin release cortisol (a toxin) into your system. Insulin resistance (meaning high levels of insulin) causes aging, heart disease, and diabetes. Low carbing stops insulin spikes and lowers insulin levels.