The 24-year-old, who weighed 23st 7oz at her heaviest, has lost nearly 11 stone and dropped an incredible nine dress sizes in just more than a year.
The customer services worker was worried she would not have the willpower to see it though, when she started her new job at cake ingredients firm MacPhie of Glenbervie.
But, despite talking about sweet treats all day and tasty treats being handed out at the end of every shift, she never gave in to temptation.
Miss Thow, of Auchenblae, Aberdeenshire, who was so heavy she could not walk up a flight of stairs without getting out of breath, now she feels like a new woman.
"I don't recognise myself half the time," she added.
"I walked past a window the other week when I was with my boyfriend and I thought, 'who's that with him', and it was me.
"It's hard to believe, I've lost the equivalent of a whole other person."
Miss Thowhas struggled with her weight since childhood. But she decided to take action after overhearing cruel comments from friends about her size.
She said: "I was heartbroken at the time but it was the wake-up call I needed. "I was sick of feeling like I couldn't do anything.
"Now I've got so much more energy.