Our expert says:
Your son is indeed underweight with a BMI = 17,2. He should increase his weight to at least 57 kg. Basically individuals who struggle to gain weight do not ingest sufficient energy for the high demands of their Basic metabolic rate and/or physical activity. I have written some articles on this subject. For basic information click on 'Diet' at the top of this page and then on 'Nutrition Basics' and 'Weight gaining' and read the articles. Companies like Nestle, among others, make meal replacement supplements Phone the Nestle Consumer Services at 0860 09 6789 and ask about Nutritional Supplements to boost your son's energy intake. You can purchase liquid meal supplements at most chemist shops. Talk to the pharmacist about your son's need to gain weight and see which products he or she will recommend. Basically he needs to eat more food either by gradually increasing how much he eats at each meal, or by taking supplements IN ADDITION to his regular meals (not to replace meals), or by having more snacks between meals. If he uses a liquid meal supplement at the rate of 200 ml 3x a day, then he should gain 1 kg per week. Feedback from other Readers has indicated that they have successfully gained weight by using a meal supplement.
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