I think I'll stick to coffee and tea.
The readable writeup here:
http://www.livestrong.com/article/481050-does-too-much-onion-affect-your-memory/
The abstract it is based on here; in mice
Authors
Hiroyuki Nishimura1, Ohki Higuchi1, Koutaro Tateshita1, Koji Tomobe2, Yasunobu Okuma2, Yasuyuki Nomura2
1Department of Bioscience and Technology, School of Engineering, Hokkaido Tokai University, Sapporo 005-8601, Japan
2Department of Pharmacology, Graduate School of Pharmaceutical Sciences, Hokkaido University, Sapporo 060-0812, Japan
Abstract
The antioxidative activity and ameliorative effects on memory
impairment by sulfur-containing compounds which occur in Allium
vegetables such as onion and garlic were investigated. The antioxidative
activities of S-alk(en)yl-L-cysteines and their sulfoxides, volatile
alk(en)yl disulfides and trisulfides, and vinyldithiins were examined by
using human low-density lipoprotein. It was elucidated that the
alk(en)yl substituents and the number of sulfur atoms in the compounds
were important for the antioxidative activities. To demonstrate the
ameliorative effects on memory impairment, onion extract and synthesized
di-n-propyl trisulfide were administered to senescence-accelerated
mouse P8. The behavioral experiments showed that onion extract and
di-n-propyl trisulfide had highly ameliorative effect of memory
impairment. Furthermore, it was found that the hippocampus lipid
hydroperoxide in senescence-accelerated mouse P8 was decreased by the
administration of di-n-propyl trisulfide. These results suggest that
di-n-propyl trisulfide contained in onion ameliorates memory impairment
in SAMP8 mouse by its antioxidant effect.
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