redgrail
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The cancer link was debunked.
http://www.msnbc.msn.com/id/12155793/
Firstly: anyone with any background in science can tell you self-reporting survey-based studies are no replacement for lab testing.
Secondly: the NCI study was over a twelve month period. The Ramazzini study which tested sweetener consumption in lab animals (rats, specifically) was over a life span. The deleterious effects of long-term ingestion have not been disproven.
Debunked is a strong word to use, especially in the natural sciences. No statistical link was shown in a large survey-based study that tracked consumption over a twelve month period in humans. This is true. However, because of the results of the Ramazzini study, I would still advise exercising caution.
I know this is a jungle of research and must be hard to navigate. But anything that's caused this much controversy is likely something you want to limit your consumption of.