Once weighing more than 102kg and wearing a dress size 22, Jessica is now a trim size 10 and weighs 69kg and is even helping others by training to become a gym instructor.
Jess from Hull, UK said: "I would eat McDonald's daily, I'd start with breakfast which would be a sausage, egg and cheese bagel, with three hash browns.
"I would visit the fast food giant up to three times per day and I didn't care about how many calories I was consuming.
"In one sitting I'd order five cheese burgers, a wrap of the day, five fries and all the fizzy drinks I could carry.
"My weight had spiralled out of control but as I worked so close to McDonald's it was really convenient.
"I was eating around 5000 calories from McDonald's but on top of this I was constantly snacking on biscuits and crisps too.
"My joints were aching and I struggled to get upstairs.
"But when you get into that state, you start hiding it as you don't want people to know how much you're actually eating.
"I had become so lazy and relied on cheap food to fulfil my appetite but when I noticed how it was affecting my kids, I knew I had to change my ways.
"I remember trying to run alongside my son on his bike but I just couldn't do it and that's when I decided to ditch the unhealthy diet.
"I joined the gym and the rest if history."
Jessica, a retail worker, soon realised she was struggling to keep up with her kids, Courtney, eight and Jack, six, before deciding it was time to make a change.
After joining a local gym in August 2017, she began working out five times a week.
She added, "I quickly realised 80 per cent of my problem was food.
"I needed to change my eating pattern and fast.
"Now snacks are a thing of the past, with my carb filled take-aways replaced with things like tuna pasta salad or grilled chicken with rice or boiled potatoes.
"I stay away from bread 90 per cent of the time."
And tuna has become a lunchtime staple for the mum.
"All the food in the house is now fresh, and I'm going to the gym five times a week," she says.
Jessica began her personal trainer course earlier this month, and hopes she can now inspire others with how she turned her life around.
JESS' BEFORE DIET:
Breakfast: McDonald's Breakfast or two large sandwiches
Lunch: Large sandwiches with crisps and sweets or McDonald's wrap of the day.
Dinner; Large portions of spaghetti bolognese, chilli, or curry with a few naan breads or four McDonald's double cheeseburgers and chips.
Snacks: Crisps, chocolate, sweets, and biscuits.
Drinks: Up to five McDonald's fizzy drinks daily, and wine.
JESS' AFTER DIET:
Breakfast: Couple of eggs and a protein bar
Lunch: Tuna pasta salad or chicken with rice
Dinner: Different types of salad with a different protein, such as fish or chicken
Snacks: Protein shakes or fruit