keeping hydrated as much as possible, and eating a good diet, we like to think that because we're flying its hard, its not we're lazy!
Take a smoothie in a thermos, nuts and rasins in a tub, bananas, even lettuce in a sandwich counts towards one portion of veg!
I used to take vitamin suppliments quite regularly, but it caused more problems than it solved, and after having blood work done told not to take anymore! Little doses now and then when your run down perhaps, but the long term effect of taking these daily havent been proved, all i know is it didnt agree with me, and since ive stopped taking them, reduced caffine intake (lots more fruit teas and hot chocolates), and more healthy eating, im doing better than ever and survived this winter with out a cold.......so far
My best cold fighting remidy is lemsip and a shot of whisky! back on your feet in no time.......slightly hungover perhaps but hey!