Keto is not a "fad diet" and is not about eating lots of fats. The core of what it's about is recognizing fat is not bad for you, and that the 3 main legs of what we eat are carbohydrates, proteins, and fats. Reduce the amount of carbs to a minimum and make up for it with increased protein and fats.

Keto is backed up by a ton of science and real-world success. Just visit the keto subreddit and spend a few hours perusing, http://reddit.com/r/keto.