Hello all , My first posting .... have been reading the newbies forum for some time as my son is mid application ! Mother of a just gone 17 year old (last month). He went for his medical today and all ok except the doc wants him to gain 5-6 lbs or 2.5kgs. The doctor said all he has to do is go back and weigh in again and he will pass him fit for service. He is hoping to join as a submariner as a weapons engineer. Any advice on how to put on the weight in as short a time as possible would be much appreciated . The offer to weigh back in stands for 3 months but my son wants to achieve this far far quicker. I would descibe him as fit as a fiddle but of a 'slight' build and needs the extra small amount of weight for the doctor to pass him as fit to serve. Any tips much appreciated.