tl;dr Refined sugar contributes to getting fat, and an early grave. No shit, Sherlock. They conveniently left out any reference to fiber, or the exact sources of said carbohydrates. Sources matter tremendously due to fiber content and levels of refinement.

Stick to fibrous veggies, beans, nuts, some fruit (berries are best), and you'll be just fine eating carbs.

I'm not contesting the fact that ketogenic diets work for people. But this study is kinda bullshit since it's basically alluding to the worst kind of high GI refined carbs