what are some current nutritional issues, such as obesity or malnutrition that might result from a fast-food diet?

Answer 1

http://www.faqs.org/nutrition/Erg-Foo/Fast-Foods.html

http://www.moneyinstructor.com/art/fastfooddangers.asp

http://www.livestrong.com/article/297094-information-on-nutrition-problems-in-public-health/