what are the reason for being thin despite of having well balanced diet?

my height is 6'2'' aqnd my weight is64kg, my weight is not appropiate to mine height,

Answers:
Some people have imbalanced metabolic rates.

Could be high metabolic rate. Could also be a low
carbohydrate/fat diet. Also could be your genetic frame
or a combination of the above. Of course you might even
have a hormonal problem.
What to do about it is another question which you did not ask. So I'll quit here.
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