From the Hershey's website...

Women and Chocolate

Many women crave certain foods, especially chocolate. Chocolate and other foods contain naturally occurring substances which are thought to affect neurotransmitters and, as a result, mood. Consequently, reports of dietary treatments for premenstrual syndrome, depression and the elimination of food cravings fill the popular media.

Critical evaluation of the scientific literature that forms the basis of these reports shows inconsistent results. One hypothesis is that food cravings exist as a way to correct a biological need, such as a nutrient deficiency or a mood disorder. If this were the case, other foods containing the nutrient or "bioactive" substance should satisfy the craving. However, few individuals find that substitute foods will satisfy their needs. For example, chocolate contains relatively high amounts of the nutrient magnesium and the bioactive substance phenylethylamine. But chocolate cravers do not seek other foods high in these substances to satisfy their love of chocolate.

More likely, a food craving represents a desire for particular sensory or cognitive experience. Women, as well as men, likely crave certain foods simply because they enjoy the taste, texture and aroma; or they associate certain foods with special occasions. Chocolate easily fits both cases! Back to Nutrition Main Page

Taken from: <A target="_blank" HREF=http://www.hersheys.com/nutrition_consumer/women_chocolate.shtml>http://www.hersheys.com/nutrition_consumer/women_chocolate.shtml</A>