Wikipedia discusses this in its article on Body Mass Index (BMI)
Your BMI is ( 50 / 1.57 ) / 1.57 = 20.28
This is at the lower end of the range considered normal, which is 18.5 - 24.9, so you are fine; if anything you could add a little weight.
too much
they can weigh up to 50 kgs
3.14 = 314/100 = 157/50
50 tons weighs 50 tons.
It weigh 50 pd
50
50
50 to 80
50
50 cents
50 pound
40 to 50