Losing weight

So over the past year, I have gained a lot of weight, and I have to lose it.  Even the doctors told me I need to lose the weight, so now I am even more determined.  The problem is, I am at work more than anything else so it is hard to be very active, but I am eating better.  I want to be back down at 150-160, because that was where I felt the best.  And I would love ideas for food and snacks.  I do have a blender bottle so any recipes for that would be great too!