ITP AND WEIGHT LOSS. The issue.

Hi...my husband was diagnosed with itp about a month back where his platelet count was as low as 1000. There was no symptoms at all just a single red blister on lips. After that he was admitted and was under steroids treatment. Pre diagnosed he was on diet for weight loss although diet was quite normal and routine, we have a doubt is it any ways responsible for itp. Also he has been loosing weight since hospitalisation he has lost around 10 kg ( maximum visible reduction on lower body it's drastic reduction )and we have heard that due to steroid you tend to increase weight. So we are worried what could be the reason for weight loss and how diet is playing role in ITP. No other issue so far except leg pain after steroid. please help us understanding the issue.