In general we need to giving him high carbohydrate, moderate protein meals in order to build up his weight but without bulking his stool. He will need about 2500 calories daily, so focus on things that the rest of us are not allowed such as cakes, custards, thick meaty soups. He will need to drink plenty of water, and over time will come to see what works best for maintaining his colostomy output. It needs to be a balance between too watery and too solid.
Rather than me listing everything out have a look at this info sheet:
patienteducation.upmc.com/Pdf/OstomyNutrition.
If you have trouble getting it to work let me know.
You can ask his doctor to write him up for carbohydrate and protein powders which you can sprinkle over his food. And he may need injections of vitamin B12 and multivitamin capsules to reduce some problems associated with poor vitamin absorption.
Rather than going on sheer body weight, have a look at his hands, arms and cheeks. As he starts to build up these should look more rounded and less 'wasted'.
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