It is interesting how what we "imagine" about food and nutrition can lead us to real life choices. Whether it's Keto, organic, vegan, clean eating, non GMO... Almost all of those choices are faith based because there is no real way to measure or show the benefits they claim. We are wonderfully adaptive generalist machines so we can tolerate, to a degree, those choices and think they are working and equally suppose, the negatives we attribute to their opposites must really exist as well. Buff or attractive pseudo science influencers promote those ideas and we rarely get to hear about their fails when they occur because they just stop blogging.
Does Keto help lose weight. Yes. Mostly because those who think they are doing it, aren't, and they just wind up being somewhat calorie reduced in terms of available energy from carbs so they dip into fat stores. But few do keto long term and when they stop they usually rebound because the diet hasn't really taught them the basics of proper diet ie. balanced nutrition, calorie counting etc... but rather binge habits like putting sticks of butter in coffee or eating a pound of bacon for breakfast.
Lot's of diets can work if you follow them short term but I would be more interested in dietary habits that I could adopt long term as true lifestyle changes. A lot of doctors seem to suggest keto is not a desirable long term choice for non epileptic adults.