Trying to lose weight, I trust? I think your proposition is over thinking it too much. It wasn't until I cut carbs that I lost fat. Low calorie diets will lose pounds in for form of lean tissue (muscle). I've tried all these calorie trackers, food input apps, heart rate monitors. Ineffective for me. Low carbs + science is the only thing I've had success with. Eat when you're hungry, don't eat when you're not. Drink more and only water. And minimal carbs.