A 18-month-old boy presents with recurrent seizures characterized by generalized 2.5–4 Hz spike-wave discharges on EEG, as shown by the pattern marked **A** in the diagram. The seizures are notably worse before meals and improve dramatically after feeding. CSF glucose is found to be 35 mg/dL with a CSF:serum glucose ratio of 0.38, while serum glucose is normal at 95 mg/dL. CSF lactate is normal. Which of the following is the most likely diagnosis?
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