Hi Wild....TG has great advice. A lot of questions can be answered from the Atkins website. Did you read the book (best advice---read it!!)? There's a FAQ sticky at the top that has a LOT of great information. I've never tried low fat so I can't answer your questions. I've also found my digital to depend on where on the floor I've got it--and I like it better than the doc's scale

It DID weigh me the same as my old dial one so I'm pretty happy with it.
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