X-Message-Number: 5364
Date: Thu, 7 Dec 1995 09:44:09 -0800 (PST)
From: Doug Skrecky <>
Subject: soy & depression 

    Like Mike Darwin and Steve Harris I have been impressed by the 
lifespan enhancing benefits of soy protein that have been documented. The 
temptation to overindulge is there for members of the life extension 
movement. Unfortunately excessive protein intake has a significant mood 
lowering side effect. (Physiology & Behaviour 561-569 Vol.39 1987) Soy is 
worse than milk casein in this regard. (Physiology & Behaviour 1-5 Vol.42 1988)
    The depressant effect of protein intake appears to derive from a 
lowering of brain tyrosine levels. (American Journal of Clinical 
Nutrition 1912-1922 Vol.32 1979) Supplemental tyrosine has in turn been 
used in the treatment of depression. (Journal of Psychiatric Research 
175-180 Vol.17 No.2 1982/83)
    I would like to suggest therefore that soy protein consumption be 
limited. 


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