Study title and author:
Low serum cholesterol and suicide
H. Engelberg MD Books:
Department of Medicine, Cedars-Sinai Medical Center, Los Angeles, California, U.S.A.Engelberg notes that cholesterol lowering trials have shown an increase in deaths due to suicide or violence. 
Studies have shown that when cholesterol is increased there is a pronounced increase in serotonin. So, conversely low cholesterol levels contribute to a decrease in brain serotonin.
Serotonin is called the "happiness hormone" (although it is not a hormone) and suppresses aggressive behaviour and harmful behavioural impulses.
More information on this subject: Books
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Recipe of the day
Homemade Beef Broth
Ingredients: Food Mall: Short Ribs
4 pounds meaty beef soup bones (beef shanks or short ribs)
3 celery ribs, cut into chunks
2 medium onions, quartered
1/2 cup warm water
3 bay leaves
3 garlic cloves
8-10 whole peppercorns
3-4 sprigs fresh parsley
1 teaspoon EACH dried thyme, marjoram, and oregano
3 quarts cold water
Instructions:
Place soup bones in a large roasting pan. Bake, uncovered, at 450F for 30 minutes.
Add carrots, celery and onions. Bake 30 minutes longer; drain fat.
With a slotted spoon, transfer bones and vegetables to a soup kettle.
Add warm water to the roasting pan; stir to loosen browned bits from pan.
Transfer pan juices to the kettle. Add seasonings and enough cold water just to cover. Slowly bring to a boil, about 30 minutes.
Reduce heat; simmer, uncovered, for 4-5 hours, skimming the surface as foam rises.
If necessary, add hot water during the first 2 hours to keep ingredients covered.
Set beef bones aside until cool enough to handle.
Remove meat form bones; give bones to favorite dog, save meat for your own use.
Strain broth, discarding vegetables and seasonings.
Refrigerate for 8 hours or overnight. Skim fat from surface. Makes about 2-1/2 quarts.
