I haven't followed the trend of the Keto movement, but I'm hearing amazing results to others. Glad it worked for you, and congratulations on your new body.
My wife actually learned about it while studying for medical school. It's much more rooted in actually science about how the body actually processes nutrients as opposed to a "woo-woo" fad diet. The goal of Keto is to shift your metabolic process into ketosis so that your liver produces ketone bodies to burn healthy fats as a source of energy once your have depleted your glucose storage.
Basically what researching Ketosis has taught me is that you shouldn't just avoid sugars, white bread, etc. but also limit certain types of fruits, vegetables and whole grains that are high in carbohydrates as they are ultimately converted to glucose and trigger an insulin response. There is some fallacious logic that just because something is a "whole food", "natural" and "not processed" that it is good for you.
Honestly, all you really need to know is that you just have to limit yourself to under 50 net carbs per day to achieve the metabolic state. I highly recommend trying it even if your goal isn't to loose weight as it can lead to better mental performance, reduced risk of heart disease and higher energy levels (as your body burns fat slowly throughout the day as opposed to getting some carbs and then crashing repeatedly).