I explained it to someone the other day like this: I am going to make a beautiful diamond necklace. I have access to the world's most amazing diamond mines, but I can't employ anyone to do any of the work for me. Where do I start with this? I don't go down to the diamond mine and take my jeweler's files and tiny drills- I take a load of dynamite, because the first thing I have to do is blow all the rocks away. Then I use my pickaxe, and my hammer and chisel to get the diamonds out of the rocks. Then when I have my rough diamond I can start using my jeweler's tools to cut and polish into shape. You can't complain BMI is inaccurate and just start adjusting your macros, doing ab crunches and drinking protein shakes when you are quite clearly 300lb with a massive gut. You need a big blunt instrument, and that is cutting calories and using your BMI as an indication of if you are in a healthy weight range. When you get to the healthy zone, then you can look at targeting specific muscle groups and tailoring your nutrition to optimal levels.