Our expert says:
Yes, you are really underweight with a BMI of only 16. If you could increase your weight to 52kg, then your weight would at least be in the normal range. Because it is just as difficult to gain weight, as to lose it, if not more so, I have written a series of articles on the subject. Click on Diet and then on 'Old Diet & Food articles' at the bottom left and you will find 'To gain weight I & II', which should give you the info you require.
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