The tests don't match the definitions in the description.

1.6403397473726824|90.43609621210567 | 27.566269840426767
Expected: 'Obese', instead got: 'Overweight'

1.7849189567364991|64.6967371697928 | 18.123158176347314
Expected: 'Normal', instead got: 'Underweight'

1.5495722923152488|46.128366942645904 | 14.884225528363228
Expected: 'Normal', instead got: 'Underweight'

After pondering your reply and playing around in python with this, I realize my less-than-elegant solution would fail too. Thanks for bringing this up! It's the kind of gotcha that can slip through a simple reading. Duly noted!

Nice. But are the breaks needed? Wouldn't the function return immediately and the breaks would never be reached?

My answer shouldn't be here twice. CW was having a server issue at the time of my submission.

Mind blown...

I have no problem with your solution, I like it!
But I did notice it fails for lower case letters. Lower case notation in music is rare, but there are those people who have systems using lower case letters.
Anyway, this is not a criticism, just a pondering of musical edge cases.

I think your solution was really elegant.

Elegant.

I would just like to say on my own behalf, "What a convoluted mess compared to the best practice solution. Noted."

I wanted to reivist this because it kept bugging me.

1. I have no objection to computerguy103 critque. He's right. But...
2. Zero is a number and one should be prepared for that, let alone negative numbers as in mortonfox's note.