"I wasn't bullied because I was fat but it drove me to lose the weight. I thought being skinny would make me seem more attractive to everyone.
"I really wanted to be thin but every time I looked at myself I thought I was fat. I would weigh myself every day and look in the mirror all the time. I would class it as anorexia.
"I thought that it looked good to be that thin and I did find that I was getting more popular after my weight loss.
"But when my friends would ask me to go out for a meal I never would because I would have to research every single item of food on the menu.
"When I went on holiday I had to exercise every day and I would watch what I eat and drink but now I can just relax and enjoy myself."
Gabrielle began dramatically losing weight in 2014 and dropped down to 6st 10lbs and a size four by 2015.
After suffering from hair loss, bad skin and being prone to pain and bruising, she visited a doctor who told her she was underweight with low blood pressure.
Gabrielle said: "Everyone kept telling me I looked ill and that I wasn't acting like myself anymore but I wouldn't listen to them.
"I would run on the treadmill for an hour every day and I would have to do extra time if I ate something like a biscuit.
"I became completely drained and had no energy. This is when I knew I needed to make a change. I decided to start going to the gym and I got a personal trainer."
In February 2016 Gabrielle joined a gym and swapped cardio exercise for weight lifting and began eating a healthier diet and now weighs a healthy nine stone.
Gabrielle said: "I have had a complete transformation and I actually have a social life now. I eat what I want but in moderation. I don't deprive myself anymore.
"I think it's an ongoing process and sometimes I will still be cautious about eating some things but I'm a lot better now.
"After my transformation I decided I wanted to help others and this inspired me to become a personal trainer.
"I'm much more positive now. Being a personal trainer encouraged me to make a lot of friends. I feel a lot more confident in myself now.
"When I see someone struggling with their weight and I can tell that they're going in the direction I went in I try to talk to them about it.
"However, when you're in that frame of mind it's really hard to listen to what people are saying. I just want people to love themselves."