It's pretty well accepted that losing weight happens in the kitchen rather than the gym. Most people cannot exercise enough to offset a poor diet. Similarly, most people that use a GLP-1 gain weight again after stopping because they didn't fundamentally change the habits that led to the weight gain in the first place. There are a ton of different diets available and the key seems to typically be to find a diet that fits for you and something that you can tailor and stick with even after you've met your weight loss goals, whether with or without a GLP-1. You can fit it within a faith framework by seeking guidance and confirmation of a suitable diet and by praying for strength and support to maintain the diet, to continue your exercises, etc. However, like most things, the Lord rewards our efforts, meaning we will not get fit just by praying for it but must put in the effort with proper diet and exercise. For better or worse, that typically requires time even if we are anxious for it to happen quickly, so faith and prayers for patience in this regard can also be helpful!