Katy Perry has a lot of endorsement deals - Walmart, Cover Girl, and Adidas just to name a few - but it's her deal with Pepsi that has people upset.

Health groups purchased a full-page as in Variety begging Perry to end her deal with the soft drink giant. An open letter to the singer says "soda companies are using you and other celebrities to convince young people that drinking soda is hip, sexy and rebellious." Some of the groups protesting Perry's endorsement deal include the California Center for Public Health Advocacy, the Latino Coalition for a Healthy California and Berkeley Media Studies Group.

There is no argument that some soft drinks can be bad for people, but should the singer drop her deal?