Video: TODAY.com

Lucas Irwin shocked his parents over the holidays when he showed up 130 pounds lighter than the last time they had seen him.

Last year Irwin made a resolution to lose weight, but he wanted to keep it a secret from his family, so he turned to the Internet for support. He maintained a strict eating regimen, kept a food diary and started exercising.

He went from 300 pounds to 170 and has made his parents extremely proud.

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