This is pretty interesting, a book What's Your Diet Type?: Use the Power of Your Personality to Discover Your Best Way to Lose Weight
can calculate how and why you may not be losing weight based on a personality quiz.

Not sure if I truly will believe the results, but you can take the quiz here.

What’s a Diet Type, and what's the the Diet Type personality quiz?

Diet Types are based on methods of classifying personalities found in the Myers-Briggs Type Indicator® (MBTI®), an effective tool for uncovering personality that has been used in workplaces and classrooms around the world for over 60 years. Just as each one of us is either right or left-handed, everyone has an inborn personality type, and although our capability to change and evolve physically, emotionally, mentally, and spiritually is limitless, our inborn personality type does not change significantly over a lifetime.

As you take the Diet Type personality quiz, keep in mind that the personality theory is not about labeling or limiting individuals. After all, besides personality, people’s
identity is shaped by age, experience, gender, cultural background, education,
birth order, and many other factors. Nevertheless, understanding your temperament (and, in turn, your Diet Type) provides a glimpse at the “why” behind what you do (and don’t do) and helps you identify not only what motivates you, but also what stresses you out. And because losing weight and keeping it off is a multi-dimensional process - physically, emotionally and psychologically - understanding yourself arms you with the necessary answers and insights you need for ultimate success. In short, no one knows “you” better than “you,” and knowing who you are is the most important information you can have when it comes to losing weight, eating healthy, and changing your lifestyle - for life!