" In other words, carbs can be seen as a far dirtier fuel than fats. When you adopt a high-fat, low-carb diet and make the switch to burning fat and ketones for fuel instead of glucose, your mitochondria’s exposure to oxidative damage drops by as much as 30 to 40 percent compared to when your primary source of fuel is sugar, as is typical in American diets today. This means that when you are “fat adapted”—that is, when you have made the transition to burning fat for fuel—your mitochondrial DNA, cell membranes, and protein can remain stronger, healthier, and more resilient. In order "

― Joseph Mercola , Fat for Fuel: A Revolutionary Diet to Combat Cancer, Boost Brain Power, and Increase Your Energy