I've never heard of that '143 perspective.'
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Yay for wanting to get to a healthier-for-you-weight -- whatever it happens to be. 
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I started on a path in June 2010 to lose 100 lbs in a year -- knowing that I was about 125 lbs too heavy for my height and for what I wanted to do with my life (i.e. be more active with my family, and LIVE for a whole lot longer.)
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I've lost 100 -- now have my sights set on that extra 25.
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 Go for it, Mama! It is so worth the work. 