I think of my weight loss efforts in terms of my self value. I have written about this in the past, but I am convinced that weight issues are 90% psychological and relate to are sense of self-worth. Mostly we just don't believe we are worth the sacrifice of exercising, giving up unhealthy junk food, making healthy food choices, skipping restaurants, counting calories, tracking food, measuring portions, weighing in, etc. It really is a sacrifice and if we don't believe we are worth that hard work, then we will eventually give up. Now when faced with a choice about sitting on the couch versus exercising or eating take out versus making something healty... I ask myself "am I worth the sacrifice" and the answer is always yes!
I also focus on asserting my will over my emotions. If we only succeed at weight loss when we are feeling positive or motivated, then we will ultimately fail. Now I force myself to do it despite the fact that every single cell in my body is screaming "NO". I heard a quote along the lines of "we are always in control of ourselves, its just that sometimes we control ourselves to do things we wish we hadn't." Don't have the original (it was more eloquent) but you get the point. We always have a choice... always. The vast majority of the time my emotions will betray my weight loss efforts and are a totally unreliable source of decision-making! I think Nike had it right... we need to "just do it" no matter how we are feeling.