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This new article i read states that in adults over the age of 65 diet soda consumption triples waist circumference gain over people who did not consume diet sodas. article

According to a study published in the Journal of the American Geriatrics Society, people who daily drank diet soda for about 10 years gained almost triple the abdominal fat than those who did not drink diet soda.The waist circumferences of diet soda drinkers gained about 2.11 centimeters, while non-users gained 0.77 centimeters around the waist. Daily consumers gained a whopping 3.04 centimeters, while occasional users' waist increased 1.76 cm.

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    Careful. You are asking about a casual relationship but the article you cite does not claim to show causation, only correlation. – Nate Eldredge Mar 18 '15 at 19:14
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This is the journal article they're citing. The article you quoted is slightly incorrect in that the increase in waist circumference is what triples.

Adjusted for initial WC, demographic characteristics, physical activity, diabetes mellitus, and smoking, mean interval ΔWC of DS users (2.11 cm, 95% confidence interval (CI) = 1.45-2.76 cm) was almost triple that of nonusers (0.77 cm, 95% CI = 0.29-1.23 cm) (P < .001). Adjusted interval ΔWCs were 0.77 cm (95% CI = 0.29-1.23 cm) for nonusers, 1.76 cm (95% CI = 0.96-2.57 cm) for occasional users, and 3.04 cm (95% CI = 1.82-4.26 cm) for daily users (P = .002 for trend). This translates to ΔWCs of 0.80 inches for nonusers, 1.83 inches for occasional users, and 3.16 for daily users over the total SALSA follow-up. In subanalyses stratified for selected covariates, ΔWC point estimates were consistently higher in DS users.

Of course, correlation does not equal causation, so it may be that diet soda makes older people fat. It might be that fat old people drink more diet soda. It's also possible that there is some other factor or factors that both measures are influenced by. The article merely notes an association.

In a striking dose-response relationship, increasing DSI (Diet Soda Intake) was associated with escalating abdominal obesity, a potential pathway for cardiometabolic risk in this aging population.

  • that was my error, the article actually mentions specifically its the waist circumference that triples. – Himarm Mar 18 '15 at 18:52
  • {nods} Although it's still slightly incorrect in that waist circumference measures more than just belly fat. – Sean Duggan Mar 18 '15 at 18:53
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    but typically an increase in adults waist circumference comes almost entirely from either fat or muscle, and at the age in the study group 65 plus, its most likely purely fat over muscle as strenuous muscle building would be rare. And the conclusion itself is that its "increasing DSI(Diet soda Intake) was associated with escalating abdominal obesity" fat, not muscle, so in essence yes they are gaining 3x the abdominal fat. – Himarm Mar 18 '15 at 18:58
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    Clearly this study shows that diet soda makes fat people old. – Adam Phelps Mar 19 '15 at 4:38
  • Dos the article say anything about causation, i.e. that there is and/or isn't any evidence of causation? Could you quote the bit from the article which does that? – ChrisW Mar 19 '15 at 9:07

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