Solus, you've been watching The Big Bang
(pun intended given this thread's topic and discussion) Theory again, haven't you? ? ? ? ?

Not go all Sheldon on your ass
(ditto), but your math is wrong. The proper FOS would be
( (weight lost) / (original weight) ) * 100, or
( ( 50 ) / (200) / 100 or
25% weight loss, not 33%
