Should I be concerned about underweight BMI?

I hope this is okay in this sub! Let me know if there’s a better place to post it.

I grew up skinny and sedentary so I’m under-muscled as a young adult. Then I got skinny-fat at uni by overeating/drinking and still being fairly sedentary (tho I started gym ish).

At the start of the month I moved to a city and my NEAT massively shot up, and as a result my weight has dropped pretty rapidly (3-5 kg in 2-4 weeks). I’ve mostly maintained strength and I’ve since increased my intake, but I’m still working it out and my weight is still dropping a little (though much slower). I now weigh 52kg at 170cm; underweight BMI is anything below 53.5 for my height.
I don’t think I am scarily/dangerously lean and my best estimate is ~12% body fat, and I feel good day to day. Should my BMI be a concern or is it not really a helpful measure in my case? Is there any point in gaining weight rapidly purely to recover my BMI, vs a small steady surplus to support muscle growth?

submitted by /u/Wtf-Jason
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from loseit - Lose the Fat https://www.reddit.com/r/loseit/comments/1uji67l/should_i_be_concerned_about_underweight_bmi/