"A Paralyzing Snack": An Endocrine Cause of Paralysis.

A case of a young Caucasian man presenting to the Emergency Department (ED) with lower limb weakness, anxiety, and sweating is described. Clinical and laboratory evaluations revealed severe hypokalemia (1.4 mmol/L) associated with thyrotoxicosis, leading to a diagnosis of Thyrotoxic Periodic Paralysis (TPP). After initial improvement following potassium infusion, the patient experienced symptom exacerbation. Further investigation linked the recurrence to excessive carbohydrate intake from vending machine snacks. TPP, a complication of hyperthyroidism, is extremely rare in Western countries but must be promptly recognized due to its potential life-threatening complications.