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A morbidly obese man trying to lose weight over fears for his dad's health actually piled on the pounds during his year filming for My 600lb Life.

Kentucky native James King documented his weight loss story on the TLC reality series, which saw him struggling after being bedridden for three years - and realising something needs to change.

However, despite travelling 13 hours to Houston, Texas via ambulance - which the insurance company refused to pay for - and admitting he needed help, it continued to spiral out of control.

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He turned to food after his parents separated and his dad Don Sr. - who remortgaged his own house to pay for the journey for his son - remarried.

It was concerns over his father's health which prompted him to try and lose weight, particularly after he realised he was helpless when his dad had to call an ambulance for himself.

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"When I am stuck in this bed and something happens to my dad, it makes me very mad that I can't get up. I want to be there for him," James - who also suffers from an extreme case of cellulitis - admitted.

"Seeing him get sick makes me want to get out of this bed and get this weight off of me.

"I want to be there for him like he has been for me."

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His time on My 600lb Life was affected by health issues, including being hospitalised with congestive heart failure - while Dr. Nowzaradan criticised his girlfriend Lisa for being his enabler.

He clocked in at over 840lbs after putting on 150lbs in just four months, and eventually made it down to 786 by the end of the year.