Though those healthy individuals not diabetic can and do often walk around quite safely
Non diabetics sometimes can have hypoglycemia and with it the effects of low blood sugars.
The rules for driving cannot be tailored to the individual so a level has to be set that covers most cases
Non diabetics may walk around and drive with very low blood sugars as to whether it's safe to do so is another matter.
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Low blood sugar without diabetes
Low blood sugar is uncommon in people who do not have diabetes.
Possible causes include:
eating large carbohydrate-based meals – this is called reactive hypoglycaemia
binge drinking
fasting or malnutrition
having a gastric bypass, a type of weight loss surgery
other medical conditions – including Addison's disease; a non-cancerous growth in the pancreas (insulinoma); or a problem with the liver, kidneys or heart
some medicines, including quinine (taken for malaria)
See a GP if you think you keep getting low blood sugar. They can arrange some simple tests to check if your blood sugar level is low and try to find out what's causing it."
https://www.nhs.uk/conditions/low-blood-sugar-hypoglycaemia/#low-blood-sugar-without-diabetes