Maternal choline supplementation (MCS) improves cognition in Alzheimer's disease (AD). However, the effects of MCS on neuronal hyperexcitability in AD are unknown. Therefore, we investigated the effects of MCS in a well-established mouse model of AD, the Tg2576 mouse. Like many AD mouse models and patients, Tg2576 mice exhibit hyperexcitability, typically generalized EEG spikes (interictal spikes; IIS). Hyperexcitability is also reflected by elevated expression of the transcription factor deltaFosB in the principal cells of the dentate gyrus (DG), granule cells (GCs). We also studied the hilus of the DG because hilar neurons regulate GC excitability. We found that hilar neurons reduce expression of the neuronal marker NeuN in Tg2576 mice, which other studies have shown is a sign of oxidative stress or pathology. Tg2576 breeding pairs received a diet with a relatively low, intermediate or high concentration of choline. After weaning, all mice received the intermediate diet. In offspring of mice fed the high choline diet, IIS frequency declined, GC deltaFosB expression was reduced, and NeuN expression restored. Spatial memory improved. In contrast, offspring of mice fed the relatively low choline diet had several adverse effects, such as increased mortality, suggesting poor health. The results provide new evidence that a diet high in choline in early life can improve outcomes in a mouse model of AD, and relatively low choline can have negative consequences. This is the first study showing that dietary choline can regulate hyperexcitability, hilar neurons, and spatial memory in an animal model of AD.