How helpful is being optimistic? Can it help you lose your unwanted weight? If so, how do you become optimistic about something you’ve failed at forever and ever?
If you are optimistic rather than pessimistic, you expect positive outcomes, and you probably make these positive outcomes a reality because your expectation of a positive outcome increases your motivation. When you are more motivated, you exert more effort. This is how being optimistic works.
Now for the issue of how do you become optimistic about losing your unwanted weight? Perhaps you have to take an indirect approach, especially if losing weight has been a losing proposition for you. You could, for instance, work on being optimistic in other areas of your life that might have some bearing on your weight. How about your relationships? Do they have any bearing on your weight? Think carefully here, and remember optimism is expecting positive outcomes, which in turn makes you more motivated, which in turn leads to you exerting more effort.
See if you can devise an optimism recipe for dealing with something in your life related to your unwanted weight and your inability so far to lose it.