As far as I know I don't have diabetes. All my blood tests are always good etc.
I usually eat low glycemic index foods, I don't eat processed foods and I don't add sugar or sweeteners to anything. I don't eat lots of fruits either.
I just started a liver cleanse protocol, that involves a diet with no fats at all and 1 liter of apple juice a day (yes, insane).
Anyway, after drinking the apple juice I feel dizzy and light headed. Could it be because I am not "used" to sugars or does it mean I am pre-diabetic or diabetic?
Doesn't mean anything. Drastic changes in diet can make you feel funny in all kinds of ways. Also, dizzy and light headed is not usually associated with hyperglyceamia. And after drinking applejuice it wouldn't be hypoglycemia either.
Is there a particular reason you think a diet of no fats at all plus a liter of apple juice would be a good idea?
Is there a particular reason why you would think you have diabetes, despite not having symptoms associated with diabetes?
If you wanted to 'cleanse' your liver a fruit juice (whether using fresh fruit or a shop bought carton of juice) should not be something to consider. If you are enamoured of GI/GL then check out fruit whilst considering the fructose content of your drinks. And as for dietary fats and cleansing the liver, fructose is (generally) stored in the liver as.... yes, you guessed it... fat.
Seems like some mix hypoglycemia and hyperglycemia here.
Hypo is abnormal low, and I have to agree with @Davie_sett that a hypo is worse than just feeling dizzy or light headed. If a diet low on carbs gives you less glucose then your body needs, making your cells starve it won’t be suprising to feel a bit dizzy or lightheaded.
Hyperglycemia are abnormal high blood sugar. Main symptoms are frequent urination, thirst and increased appetite.