The calories from fat really doesn't have a whole lot to do with weight loss. People see only 10 calories is fat and forget to notice the other 150 calories for one serving.
Totally agree about the forgetting to notice the calories per serving! I think that is just the ignorance in knowing how to interpret the label. You should look at the whole thing rather than just one part of it. However the percentage of fat per serving has a lot to do with my weight loss. if I do happen to pick up something and check it out, I always look at the calories from fat. If the percentage is too high then I put it right back immediately! However if the fat calories are in my preferred range then I look over the other parts of the label especially the ingedients and then decide if I want it.