Broccoli is high in lignans, a phytoestrogen compound that has been shown to benefit cognitive kills (thinking, reasoning, remembering, imagining, and learning words.  A 2005 study by researchers at King's College London (United Kingdom) revealed that broccoli also is high in glucosinolates, a group of compounds that can halt the decline of the neurotransmitter, acetylcholine, which is necessary for the central nervous system to perform properly (low levels of acetylcholine are common in those with Alzheimer's Disease).  If you're not fond of broccoli, try other glucosinolate-rich foods such as: potatoes, oranges, apples, radishes and other cabbage-family vegetables like Brussels sprouts.

"The mind grows by what it feeds on." ~ J.G. Holland