Back for the third time

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Hi everyone, I started in 2012 lost 90lbs, gained it back, 2015 lost 80lbs, gained it back, I am about 212lbs now, lost 90lbs, need to lose 27lbs more. The the dreaded maintain. In my lifetime. I have never been able to maintain. I have good focus for a short amount of time then give up. I am 55 yrs old and can't do this anymore. I need to be healthy to save my life. God willing this time will be different.