Sat, Mar-11-17, 09:25
|
 |
Senior Member
Posts: 15,075
|
|
Plan: mostly milkfat
Stats: 190/152.4/154
BF:
Progress: 104%
Location: Ontario
|
|
An example of just how unimpressive a 13 percent reduction in prevalence really is;
Quote:
Dietary fiber intake and risk of type 2 diabetes: a dose-response analysis of prospective studies.
Yao B1, Fang H, Xu W, Yan Y, Xu H, Liu Y, Mo M, Zhang H, Zhao Y.
Author information
Abstract
Observational studies suggest an association between dietary fiber intake and risk of type 2 diabetes, but the results are inconclusive. We conducted a meta-analysis of prospective studies evaluating the associations of dietary fiber intake and risk of type 2 diabetes. Relevant studies were identified by searching EMBASE (from 1974 to April 2013) and PubMed (from 1966 to April 2013). The fixed or random-effect model was selected based on the homogeneity test among studies. In addition, a 2-stage random-effects dose-response meta-analysis was performed. We identified 17 prospective cohort studies of dietary fiber intake and risk of type 2 diabetes involving 19,033 cases and 488,293 participants. The combined RR (95 % CI) of type 2 diabetes for intake of total dietary fiber, cereal fiber, fruit fiber and insoluble fiber was 0.81 (0.73-0.90), 0.77 (0.69-0.85), 0.94 (0.88-0.99) and 0.75 (0.63-0.89), respectively. A nonlinear relationship was found of total dietary fiber intake with risk of type 2 diabetes (P for nonlinearity < 0.01), and the RRs (95 % CI) of type 2 diabetes were 0.98 (0.90-1.06), 0.97 (0.87-1.07), 0.89 (0.80-0.99), 0.76 (0.65-0.88), and 0.66 (0.53-0.82) for 15, 20, 25, 30, and 35 g/day. The departure from nonlinear relationship was not significant (P for nonlinearity = 0.72), and the risk of type 2 diabetes decreased by 6 % (RR 0.94, 95 % CI 0.93-0.96) for 2 g/day increment in cereal fiber intake. Findings from this meta-analysis indicate that the intakes of dietary fiber may be inversely associated with risk of type 2 diabetes.
|
According to this study, increasing total fiber from 30 grams per day to 35 grams per day decreased type 2 diabetes prevalence (they say risk, they should mean prevalence, risk implies cause) by 13 percent. Not a lot of plausibility here. A more likely explanation is that people generally more health conscious at the time tended to eat more fiber. Not everybody who eats high fiber is health conscious. Some of them might just really really like Taco Bell, maybe correcting for Taco Bell would have yielded even better results.  They talk about dose response, but as dose goes up, percent of group that's health conscious could very easily go up, dose response doesn't really imply causation. |