Per USA Today: "Low-carb diet linked to early death, medical study suggests"
"Cutting carbohydrates might also cut lifespan by up to four years, according to a new medical study."
Wow - it sure seems like the keto diet contingent has it all wrong... Until you look at the study, here:
"both low carbohydrate consumption (<40%) and high carbohydrate consumption (>70%) conferred greater mortality risk than did moderate intake, which was consistent with a U-shaped association (pooled hazard ratio 1•20, 95% CI 1•09–1•32 for low carbohydrate consumption; 1•23, 1•11–1•36 for high carbohydrate consumption). However, results varied by the source of macronutrients: mortality increased when carbohydrates were exchanged for animal-derived fat or protein (1•18, 1•08–1•29) and mortality decreased when the substitutions were plant-based (0•82, 0•78–0•87)."
So, what we see is that too much animal-based nutrition is what is at fault, and that substituting plant-based protein or fat for carbs does in fact increase longevity.