Disheartening : knowing that your fitness goals (lose about one pound every two weeks) are attainable and therefore you have absolutely no excuse not to achieve them.
Soul-destroying : working out religiously all week only to discover you have gained a pound instead of lost it.

GAH!, C. cries out to you in angst.

But, C., you say helpfully and soothingly, you know that muscle weighs more than fat and you have been sticking to your weight lifting with admirable regularity.  You spend an hour in the gym every weekday, and sometimes saturdays, and you try really hard to eat a balanced diet, you even take vitamins.  And look how flat your stomach is!  The arm flab is gone too!  Do try and have a little perspective here.  And C., you say a little more firmly and with much less patience, it is one pound.  Surely your melodramatic tendencies can be put to more effective use on another angsty problem. 

No!  (C. wails)  I am picking up my wedding dress on Saturday and already in a nervous panic to see what they alterations girls have done to it and now I am the size of a walrus!  And it’s not even about the wedding (C. howls, swathing herself in sackcloth)!  I know it’s just one pound.  It’s just one of those days: I’m fed up with my job, my internet keeps cutting out, and I gained a pound.  And I really…want…a brownie…!  !

You, shaking your head in disgust and turning about sharply, merely curl your lip.  C., you are being ludicrous.  Let’s talk when your sense of reality reinstates itself.

(Humbly) Ok.