How to stop losing weight when you have reached your 'goal' ?

Anonymous
I've been losing weight for over half a year now just by exercising and eating healthy :) but now I weigh 52kg (114lbs) and I'm 1m72 (5'8) tall with is technically underweight (BMI 17,5) so I know I should stop losing weigh. But I have trouble allowing myself to eat more or eating 'junk' and I don't want to give up exercising because I'm training for my first marathon. Does someone has some advice for me?
How to stop losing weight when you have reached your 'goal' ?
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