You don't need am employer sponsored fitness plan to lose weight..
Its called getting off yer butt and excersing and eating decent.
This is not easy..i know..I'm overweight myself..but in the past 3 months have managed to lose about 30 pounds or so, just by making myself go for that evening walk, and cutting out all the foods which my body does not need.

Some people have medical issues, fair enough..but that is the small minority..

Put the junk food down...go for a walk...