The expected prevalence of Alzheimer's disease (AD), the most common neurodegenerative disease triggered by aging, comes to be a critical problem. Although the cause is clear, accumulation of amyloid-β (Aβ), we still cannot totally cure this disease. Hence, it is essential to prevent the symptoms appeared. A number of studies have reported that soybean supplementation prevents cognitive dysfunction. Besides being a rich source of vegetable proteins, soybean contains other functional ingredients such as phytoestrogens, oligosaccharides, and dietary fibers. Especially, recent studies suggested greater functions with green soybean. Comprehensive analysis of gene expression in the brains of mice that ingested soybean using high-density oligonucleotide microarray suggests that an increase of an endogenous Aβ-chaperone, lipocalin-type prostaglandin D2 synthase (Ptgds), lead to suppressed Aβ accumulation, resulting in the prevention of cognitive dysfunction. Here we will review estimated effective components and underlying mechanisms of soybeans, suggested by comparing effects of green and yellow soybean breeds to mice.