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(CNN) -- Misty and Larry Shaffer have been together since high school. She went to his senior prom; he went to her junior and senior proms. They got married in October 2008.

He never said anything about her being overweight.

When Larry, an Army specialist, was deployed to Afghanistan for a year in 2012, Misty decided she wanted to get in shape.

She weighed about 260 pounds when he left, and less than 155 pounds when he returned.

I just sat in bed one night and was like, 'I can do this,' she said. 'I need to do this.'

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