The quality of memory is related to the degree of excitation of neurons, and acetylcholine can promote the excitation of neurons. Choline-rich foods like eggs, animal liver, and beans can boost the synthesis of acetylcholine, which can help improve your memory. Choline in eggs is mainly concentrated in the yolk. Healthy people can eat 1 to 2 eggs a day, and patients with hyperlipidemia should eat one every other day.