People will choke, hyperventilate and die
Diabetic ketoacidosis is a condition which is thought to affect about 1 in 750 people in their lifetime. More information can be obtained from reputable medical journals or a doctor.
holly couldn't breathe so i gave her a paper bag so she could hyperventilate
If hyperglycemia is left untreated, it can lead to ketoacidosis.
To breathe excessively.
Diabetic ketoacidosis is caused by lack of insulin, and is generally triggered by some other body insult including dehydration, fasting, illness or infection. Once ketoacidosis begins in earnest, it causes itself to get worse. All of its symptoms are also causes of further problems, so it will generally continue to advance until treatment or death. More details on the mechanism of how ketoacidosis begins are available on the wikipedia link below. Ketoacidosis is often associated with hyperglycemia (high blood sugar), but hyperglycemia won't actually cause Ketoacidosis. They are both caused by shortage of insulin.
It speeds up.
Diabetes
you could pass out/run out of oxygen
Yes
You hyperventilate.
Free divers do but scuba divers do not need to. Scuba divers take their air with them and would have no need to hyperventilate.