Dizziness when hungry

Dizziness when hungry usually reflects a fall in blood sugar (glucose) between meals or after a long gap without food. As glucose dips, the body releases adrenaline to correct it, producing shakiness, sweating, palpitations, hunger, anxiety and a light-headed feeling; eating restores the sugar and the symptoms settle. For many people this is a mild, normal experience — a 'reactive' dip a few hours after a carbohydrate-heavy meal, or simply the effect of going too long without eating, dehydration, or standing up quickly. In people with diabetes on treatment (insulin or certain tablets), these are true hypoglycaemic episodes that need attention. Less commonly, recurrent, well-defined spells of low blood sugar — particularly ones that come on with fasting rather than after meals, that cause confusion or unusual behaviour, or that need sugar to resolve — point to a problem generating too much insulin. The classic, though rare, cause is an insulinoma, a small insulin-secreting tumour of the pancreas, diagnosed by capturing a low glucose alongside an inappropriately high insulin and C-peptide. Certain hormone deficiencies (such as adrenal insufficiency) and heavy alcohol use can also cause lows. So the everyday version is benign, but a recurrent, striking pattern deserves investigation.

• A normal dip in blood sugar or simple hunger — the commonest, harmless reason; settles with eating.
• Reactive dip after a carbohydrate-heavy meal — a few hours later.
• Going too long without food, dehydration, or standing up quickly.
• Hypoglycaemia in people with diabetes on treatment — insulin or certain tablets.
• Heavy alcohol use — can lower blood sugar.
• Insulinoma — rare; an insulin-secreting pancreatic tumour causing fasting lows with confusion or sweating.
• Adrenal or other hormone deficiency.

Occasional mild light-headedness relieved by eating usually needs no tests. When spells are recurrent, clear-cut or come with confusion or sweating, the aim is to capture the blood glucose during an episode and, if it is genuinely low, to measure insulin and C-peptide at the same time — an inappropriately high insulin and C-peptide during a low points toward an insulinoma. A supervised fast is sometimes used to provoke and document a low. Related tests include HbA1c (in people with diabetes), and hormone screening (such as morning cortisol) where an adrenal cause is possible. Mediora.AI can surface a low glucose with raised insulin and C-peptide from your results and flag the hypoglycaemia pattern; the interpretation belongs with your doctor.