Weight loss is easy when you also focus on losing weight on the inside. That is what spiritual fitness all about. You struggle with weight because you a strong mental attachment to negative eating habits and lack of physical activity, and because your current habits help you cope with the internal challenges.
If you can remove the barriers that keeps you stuck in your internal struggles, and mentally attach to positive eating behaviors and working out, you will see a complete transformation with your body. That is spiritual fitness.
The key is to focus on your wellbeing.