One day of self-reported data extrapolated over 18 years? Knowing what we know about psychology of self-reporting and the changing of diets for people over tim

One day of self-reported data extrapolated over 18 years? Knowing what we know about psychology of self-reporting and the changing of diets for people over time, you think that this study means anything? Is it any surprise that it shows very odd, contradicting results based upon age groups? do you honestly think that NO conclusions can be drawn from observational studies? Well, I didn't say that - but if the study referenced is the best they could do then they might as well give up. Haven't you noticed the meta analysis of many studies recently that show that most of the original studies were flat-out wrong? Do you think maybe it might be because of weak studies like the one in this article?