You misunderstand, what I mean is that the auhtor drastically overshot by making it 150kg. If I one day stepped on a scale and suddenly realize I weigh 2 to 3 times what I did before while not looking any different, my first thought wouldn't be "Oh boy I need to lose this weight" it would be "yeah this scale is busted." Like I weigh 106kg, if I one day stepped on a scale and it showed 200 and I looked the same it's the scale not me. Girl didn't even consider that the scale might have been broken. It'd be more believable if it showed, I dunno like 70 or 80kg, but 150 is too much of a stretch.