Most previous studies reported similar activities for phytochemicals: (i) reducing oxidative-stress induced free radicals via an antioxidant effect, (ii) boosting the phagocytic properties of immunological cells to aid in the clearance of Aβ/senile plaques in AD, and Lewy bodies in PD, (iii) increasing neurotransmitter concentrations in the vicinity of neurons by inhibiting neurotransmitter cleaving enzymes, (iv) adapting to the prevailing stress conditions by affecting the differentiation properties of neurons, and (v) inhibiting AChE activity. Here, ACHE is linked to Alzheimer disease.