Before and after: Gabrielle May weighed 90kg at her heaviest. But after being determined to lose weight for good, she banished her tummy to get a toned figure just by tweaking diet

The mother slimmed down to a size six and eight after exercising and eating smaller portions

Before her weight loss, Ms May said she led a 'sedentary lifestyle' after she got pregnant with her fifth child

A mother who struggled with her fluctuating weight after her fifth pregnancy has dropped five dress sizes in an astonishing body transformation.Personal trainer Gabrielle May, from Hobart, Tasmania, weighed about 198 pounds after "mindlessly eating" convenient prepackaged meals - and she would sometimes devour a whole family sized dessert in one sitting.At her heaviest, the 34-year-old said she wore size 16 clothing and she found the daily tasks of being a mother challenging. But determined to get on top of her weight once and for all, she banished her tummy and sculpted a toned figure just by tweaking her diet and exercising.Before her weight loss, May - who documents her body transformation on Instagram - said she led a "sedentary lifestyle" after she got pregnant with her fifth child."I'd never been overly active, I was thin due to an illness and then when I got pregnant with my fifth baby, I gained a lot of weight and had no strength,' she told Daily Mail Australia.'The issue with my weight had nothing to do with my worth, my beauty or my value. But it made life hard. It made getting up in the morning, hard," she said. "It made walking and sleeping hard. To be constantly uncomfortable, out of breath and aching is hard. I was miserable and didn't even know there was another way to live."I was always tired, lacked confidence, put myself last every day, every time. I struggled with the daily tasks of being a mom and I had no energy left at the end of the day to do anything."After her marriage breakdown, May said she was in a "very lonely place" and she would mindlessly comfort eat with no portion control."Everything was for convenience so I was eating lots of prepackaged foods,'" she said. "I thought I ate pretty healthy. I'd have 'healthy' cereal for breakfast, maybe with yogurt too."Mindless eating led to lots more food intake than I probably even remember."