Searches on several databases and websites for "obesity" yielded the following number of hits:

Medline: there are 597 journal articles relating to obesity, morbid obesity, anti-obesity agents, and obesity and diabetes.

CINAHL: there are 4267 articles pertaining to obesity and morbid obesity.

Google: a keyword search yielded 3,060,000 hits, with the first link to the American Obesity Association.