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Sweeteners Found to Block Weight Loss 
Testing on aspartame suggests that it interferes with a beneficial enzyme, intestinal alkaline phosphatase, necessary to a healthy metabolism, thereby preventing weight loss. Deutsche Welle has the story: http://www.dw.com/en/sugar-free-products-stop-us-getting-slimmer/a-36504096

Gut Microbiome Altered in Dieting 
Researchers in Israel have found evidence that the phenomenon of yo-yo dieting, quick weight loss followed by rapid weight gain, is down to intestinal flora. The researchers found that changes that occur during intense dieting change the intestinal microbiome to make it much easier to regain the weight lost, in the diet’s aftermath. (It might be noted, earlier studies implicate artificial sweeteners in changing the gut microbiome, as well.) The Sydney Morning Herald reports: http://www.smh.com.au/lifestyle/health-and-wellbeing/nutrition/scientists-say-gut-microbes-may-play-role-in-yoyo-dieting-obesity-20161127-gsyswk.html

Common Substance Found to Extend Life 
A well-known biological chemical, spermidine, just got a lot more interesting. Known as an essential chemical for living tissues. It had been shown to have life-extending effects on invertebrates, but only now has it come to light, the same effect can be enjoyed by mammals. The implications may well be significant for humans. Ars Technica reports: http://arstechnica.com/science/2016/11/mouse-lifespan-heart-health-extended-by-common-chemical/