There was a recent dietary study published in the well regarded Lancet medical journal titled "Dietary carbohydrate intake and mortality: a prospective cohort study and meta-analysis" that has received a great deal of publicity, but little skepticism which is a shame because it is a pretty shoddy piece of research. Unfortunately, because it was published in the Lancet itis accepted as gospel. I won't attempt to dissect the study myself because there are others far more knowledgeable and articulate than myself that have done so that I encourage you to read them for yourselves:

[zoeharcombe.com]

[psychologytoday.com]

In a nutshell, the study suggests that 55% of daily calories consumed as carbohydrates will prolong your life by 4 years on average. However, the authors I linked to above clearly illustrate that that conclusion cannot be plausible, but only perpetuates the same lie that low fat and high carb is the way to a healthy lifestyle when we know the opposite to be true.