We have been here before many times. Nutritional epidemiology studies have a terrible track record of establishing causal relationships (e.g., Beta-carotene and lung cancer, selenium and prostate cancer, etc all were not replicated when the definitive clinical trials were done). The problem is that statistical models with questionable and often untestable assumptions are used, but the results are reported as if these models were fault-less. The result is overly optimistic estimates of statistical significance and inflated confidence in study findings.