There are a number of problems with that study, especially if you intend low carb diet to mean ketogenic diet. The macro ratios to achieve and maintain ketosis are very specific and there's no indication that ketosis was the low carb twin's goal. So that'd be my first comment: the distinction between a low carb diet and a ketogenic one is important, especially as regards your body's metabolic processes. Yes, ketogenic diets are necessarily low carb, but the reverse is not always true.
I expect people to reject my lifestyle. There are a lot of tacitly accepted preconceptions and keto flies in the face of many of them. But all I know is my lipid panels are excellent, I'm no longer pre-hypertensive, my BMI has dropped, and I'm at my lowest weight since high school. Not to mention my increased energy, better sleeping habits, healthier skin, gums, nails, etc. Definitely isn't anything close to the "misery" that Fiz referred to.
For the sake of discussion, what was your dietary habits prior? Did you go from eating whatever you wanted to watching what you eat? Did you start working out?