The woman, known as AvocadoToes online, went from 22st 2lb to 10st 3lb over a three-year period.
At 5ft 8in, she's lost an incredible 11st 13lb and, thanks to her efforts, she has almost reached a normal BMI.
The 20-year-old from Oregon in the USA shared pictures of her weightloss journey online and was flooded with compliments.
Her first image, taken when she was 18, reveals her struggle to reach success simply: "Went to college. Ate less, moved more, and learned how to care for my body and mind with things other then food."
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AvocadoToes reveals that her mum recently had gastric bypass surgery - but that wasn't for her.
She reveals: "In my opinion, the easy fix is moving more and consuming less, rather than having an invasive surgery that reroutes your digestive system and prevents you from eating normally for at least a few months or years."
My mother recently had gastric bypass and... it is a serious surgery with life long repercussions that has been used as a last resort.
"Bariatric surgery isn't a fun get-in, get-out kind of thing, and it's so much b******* that people think once you get it all your problems are solved."
AvocadoToes posted her images and got some really lovely rection from Redditors online.
MrBiggles87 commented: "Incredible transformation and amazing dedication. A true inspiration for anyone looking to transform themselves. You look fantastic." more photos
