[methodOverdrive]

I didn't read the study, but the WSJ article also didn't even mention the amount of fat or carbohydrates in the diets. I wouldn't be surprised if a "low-carb, but not actually ketogenic" diet was bad for you - if you're restricting carbs to be lower than the control 50% but still consuming, say, 20% carbohydrates, then you would never even become keto adapted.