Our expert says:
The most basic guide on the 'ideal' body weight is the BMI, which is equal to weight divided by height (m) squared. The ideal would be between 20 and 25 (a wide range, admittedly), and yours is equal to 17.5, and so yes, that is very low. For your height, in otherwords, you are very underweight, and so perhaps you have overdone it slightly. Having said that, some people can eat very normally, and there's nothing untoward, but they just cannot gain anymore weight. If this is your situation and you have achieved this weight loss through good eating habits and regular exercise, then I actually think there is only a limited amount you can do. HOwever, if you have lost this weight and now find that in order to maintain it, you have to watch what you eat like a hawk and you have to exercise religiously whenever you can, then that's a problem and that is where I would draw the line. It's difficult, but certainly you are very light for you height, and so I would encourage you to look at increase your mass, perhaps by looking first and diet. If your diet is adequate, not lacking in anything at all, then maybe exercise can be looked at (I'm not sure what you have done with regards to exercise). I think the best is to see a dietician about the diet though, and then take it from there.
Anything between 55kg and 65 kg would actually be normal, although as I said, that may not be possible and so just deal first with your diet and then see what happens from that.
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