It is really great to see more studies regarding low carbs diets. They are widely used in the fitness industry based on ‘Broscience’ and many Instagram models are paid to promote this kind of lifestyle.
we estimated that a 50-year-old participant with intake of less than 30% of energy from carbohydrate would have a projected life expectancy of 29·1 years, compared with 33·1 years for a participant who consumed 50–55% of energy from carbohydrate (difference 4·0 years [95% CI 2·6, 5·3]). Similarly, we estimated that a 50-year-old participant with high carbohydrate intake (>65% of energy from carbohydrate) would have a projected life expectancy of 32·0 years, compared with 33·1 years
You're all over this thread like a bad rash.
So, the "low Carb group" (Q1):
had higher % of smokers,
had higher % of diabetics,
exercised less,
had higher % of men.
In this study, the higher smoking, higher diabetic, lowest exercising, and higher male cohort were more likely to die. To ascribe causality on the diet, one that is not even a low carb diet is absolute bullshit.