With thousands or even tens of thousands articles on the net that provides weight loss tips, wouldn't there be a chance your article and that particular article will be very similar?
If I were to combine, say, 10 articles and spin them a little, Will Panda see that as an unique article or a duplicate?
Thousands/tens of thousands?... Hmmm...
Do you realise that Google indexes a Trillion pages, and that weight loss is one of the largest niches on the planet. From recent stats I've seen, I'd say your looking at in excess of 100 million indexed pages on weight loss - and probably around 1 billion in the supplemental index.
Uniqueness is an entirely misunderstood topic. Copyscape is useless as it just looks at 3-4 word quanta and looks for multiple instances. It's a quick and easy estimate - but only that.
Do you really think that you can find another way of saying 'eat less calories and you'll lose weight' that hasn't been already been said on those billion pages?
And you need to distinguish between auto-spintaxing and human spinning - as Songer states above...
AutoSpintaxing, while horrible in the wrong hands, CAN produce OK content with a quick manual check afterwards - for MASS submission to article directories etc. There is such a proliferation of bad grammar today - and non-english speaking writers, that this just doesn't matter. And by 'doesn't matter' - I'm not talking ethically/aesthetically - but
commercially. Submissions are just place-holders for links. PERIOD. You aren't trying to win a Pulitzer!
Manual spintaxing is the only way forward. But PROPER manual spinning is 3D spinning. ie.
1) Multiple paragraphs and reordering and random substitution.
2) Multiple sentence rewrites and random substitution.
3) Nested braces spinning of sentence chunks and words/word groups.
We call them 'UberCubez' btw, and have used hundreds of them to build multiple large networks (250 sites+ and 1-3k pages each.)
Uniquness needs to be looked at from 2 perspectives:
1. On your own sites
Here you really need to avoid
intra-site duplication - as this looks bad to the SE's. Multiple pages saying the same thing on the same site is a no-no in SEO.
2. For public properties
Some
inter-site duplication is inevitable. Concentrate on what is appropriate. For articles/2.0's, just get them as unique as possible inside of your time/tools constraints. ONLY do manual writing if you're building large spun-constructs - as this massively leverages your time. The days of writing a single unique article for E-Zine are long gone!