Hi dr, I am staying in bangalore since 10 year... Whenever weather changes...i get sick or start feeling unwell Where as mine brother who is solider in army and posted here ...is fit and fine any weather( touchwood).. I do excersie atleast 10hr as week or even not need cover minimum 5km in a day by walk. I fear of Dieases always and specially cancer...he is always positive... Is this due to some biological issue in both of us body?? We both are having same physical appearance..same food habbit But i get unweel every 2.month... Whay could be reason Blood reports are ok expect i am prediabetic I am software engineer..