Personally i'm all against being tunnel visioned on weight loss. Its far easier to lose weight by focusing on building lean muscle while maintaining a long term diet change. That means extra time should be spent on actually learning more on nutrition and food labels and working onwards from there. Its possible to focus entirely on the weight loss part, but then it hinges alot on success and failure and self motivation. And exact bodyweight changes over the course of the day , so hopping on the scale when you're dehydrated would yield false positives. An overall lifestyle change towards muscle training doesn't mean you're trying to look like arnie.