La maca, otro caso en el que más no es mejor

Ann N Y Acad Sci. 2010 Jun;1199:77-85.
Neuroprotective effects of Lepidium meyenii (Maca).
Pino-Figueroa A, Nguyen D, Maher TJ.
Source

Department of Pharmaceutical Sciences, Massachusetts College of
Pharmacy and Health Sciences, Boston, Massachusetts 02115, USA.
alejandro.pino@my.mcphs.edu
Abstract

The neuroprotective activity of the plant Lepidium meyenii (Maca) was
studied in two experimental models: in vitro and in vivo. Crayfish
neurons were pretreated with vehicle or the pentane extract from Maca,
subjected to H(2)O(2), and their viability determined microscopically
and chemically. A significant concentration-neuroprotective effect
relationship was demonstrated. The pentane extract was then
administered intravenously to rats prior to and following middle
cerebral artery occlusion. While infarct volumes were decreased for
the lower dose, higher doses increased infarct volumes compared to
controls. These results suggest a potential application of Maca as a
neuroprotectant.

PMID:
20633111
[PubMed - indexed for MEDLINE]

Dos estudios sobre el guaraná

Dos interesantes estudios (texto completo) sobre el guaraná el el
sitio de una babiba energizante isaraelí http://www.drinkwakeup.com/

Guarana

A clinical study conducted by the British Psychopharmacology Board
published in 2007 in the Journal of Psychopharmacology examined the
range of effects of a standard Guarana extract of varying dosages (37.
5 mg, 75 mg, 150 mg, 300 mg). Results proved that the lowest dosages
achieved the best results, although in all dosages there was an
improvement in the secondary memory, alertness and mood.

http://www.drinkwakeup.com/contentManagment/uploadedFiles/fileGallery/
guarana.pdf

Lo cual muestra que más no siemrpe es mejor.

Guarana Versus Coffee

A comparative research between Guarana, Coffee and Yerba Mate studied
the effectiveness towards improved alertness during the noontime. The
results of this study have shown that Guarana is more effective than
coffee and Yerba Mate in improving alertness

http://www.drinkwakeup.com/contentManagment/uploadedFiles/fileGallery/
guarana_-_a_comparison_with_coffee.pdf

Encuentran una molécula en cuya ausencia la memoria de los mamíferos se multiplica

Un equipo de científicos del Baylor College of Medicine (BCM) de
Houston (Texas) parece haber encontrado una molécula en cuya ausencia
la memoria de los mamíferos se multiplica.

La molécula en cuestión es la PKR, estudiada durante años por su
labor como protectora de los mamíferos contra infecciones virales.
Pero el equipo liderado por el doctor Mauro Costa-Matiolli, profesor
de neurociencia en BCM, observó que la actividad de esta molécula
aparecía modificada cuando un paciente presentaba algún tipo de
desorden cognitivo, por lo que comenzaron a estudiar su función en el
cerebro.

http://www.abc.es/20111208/ciencia/abci-memoria-201112081932.html