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Rarer side effects include acute gallstone disease and pancreatitis, and the NHS warns that there is also a risk of hypoglycaemia, which happens when your blood sugar level drops too low.

If several products are drunk by a child in a short space of time, the FSA said it could cause shock, hypoglycaemia and loss of consciousness.

Cleo's hypoglycaemia - a condition related to low blood sugar - means she sometimes has to stay overnight.

In the hours that followed Letby's arrival, Baby L's glucose levels fell abnormally low and he had to be given additional doses of glucose in an attempt to correct the hypoglycaemia.

However, both methods are very restrictive and can cause side effects on days of total fasting or severe caloric restriction — hunger, negative effects on mood and risk of hypoglycaemia.