At least 3 times a week.

They are separte eating disorders, but do have a common thread. Binge eating is where a person "binges" often. A binge is where a person consume large amounts (to the tune of hundreds to thousands) of calories in a very short amount of time. Impulsive eating is where a person sees or thinks of a food and they just randomly decides to eat it.

alcoholics and stereotypically college students

A bineg eating disorder is where a person continually "binge" eats. This means that they eat excessive, large amounts of food in a relatively short period of time. This food is usually not very healthy. As a result, there can be weight problems, health problems related to obesity, the likelyhood of developing bulimia (to purge after such bingeing), and depression.

Somewhere around the 1860's, I believe