There are numerous examples throughout medical history in which bias affected the way disease were indentified and treated. In the nineteenth century, women's depression and anxiety, often a result of hormonal fluctuations, or of the oppressive male-dominated society in which they lived, was classified as "hysteria" and treated psychiatrically as a female neurological "problem." In the period 1910-1930 African-Americans in the deep south were claimed to be biologically "lazy," when later examination showed many to be infected with a debilitating parasite, hookworm. Today, children who are often merely bored with school or who eat a lot of fast foods (which are full of energy--producing sugars) are diagnosed as having a disease called "Attention Deficit Hyperactivity Disorder" (ADHD) , and treated with the drug, ritalin. The rise in inner-city crime in the late 1980s and early 1990s was claimed to be the result of genes for violence, especially in the black and Latino population (no such genes have ever been found but the argument persists today, especially within the psychiatric community and the popular press). These are all cases where what is or is not considered a disease, or how that disease is to be treated, are the result of social belief systems rather than sound, unbiased medical or biological knowledge.