First of all, welcome to the board.
Well, 170 lbs X .12 (BF) = 149.6 lbs LBM and 20.4 lbs fat
165 lbs X .10 = 148.5 lbs LBM and 16.5 lbs fat.
If you do it right, you are losing 1 lb LBM and 4 lbs. fat in your scenario. Of course, the trick is to spare the muscle and lose the fat. If you do it wrong, you could very well lose 5 lbs. of muscle - not a desirable scenario. It will get harder and harder the less fat you have to get rid of. What worked before may not continue to work as effectively going forward. So read up on this board and shake things up in your routine and your diet and you might be more successful than otherwise.
Body part measurements are also a good way to monitor your effectiveness in doing this, along with your BF% assessments.
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