Four colors of sweet peppers (green, yellow, orange, and red) exert antioxidant activities and inhibitory effects on Alzheimer’s disease-associated key enzymes, such as acetylcholinesterase, butyrylcholinesterase, and β-secretase, and thereby may be useful for the prevention of Alzheimer’s disease [18]. The gene discussed is ACHE; the disease is early-onset autosomal dominant Alzheimer disease.