A teacher went from a size 28 to a size 12 after feeling guilty she was teaching her children to eat healthy when she was piling on the pounds.
Deb Thomas, from Newport, South Wales, weighed 256lbs just 16 months ago when she was teaching lessons in health education at her primary school.
But the self-confessed 'obsessive eater' started to beat the bulge after one day realising she was giving mixed messages to her class.
Pupils at Nant Celyn Primary School were being told to eat healthy meals but Deb was ignoring all the advice herself.
Now in an amazing turn-around Deb has lost over 112 pounds and dropped to just 144lbs.
Mother-of-three Deb, 49, - who is 5ft 3ins tall - said: 'In my teaching there's also a strong focus on young people eating healthily, and I felt so hypocritical delivering lessons like that when I wasn't abiding by it myself.
'I was becoming really unwell, and just knew I was headed for big trouble.'
Before her weight loss Deb ate a fried breakfast, would graze on biscuits and cakes through the day and have a take away, such as curry or pizza in the evening.
She replaced this with a melon and a low fat yogurt first thing, a salad for lunch and home made pasta for dinner. If she gets peckish she snacks on fruit or cereal bars.
Ms Thomas, said: 'Apart from the fact I feel fabulous now, problems with my feet have cleared up and I can't believe the improvement in my eye sight.'
She said she also feels more comfortable speaking to her classes about healthy living, and hopes she can be a role model for others.
Deb said: 'I would be really happy if any of the children wanted to ask me for advice, because now I can teach from experience.'