It depends. It is eating very clean and actual food that is not processed or comes in a box if it makes sense. For example, increased amounts of vegetables, but not all vegetables are keto compatible. Maybe that can be a bit expensive some places.

But really it is quite simple and does not require any kind of supplements or special substitutes. It's meat, cheese, vegetables and nuts.

Maybe it is not always easiest for people to stick with, because carbs are delicious and there's also sugar with them. It is hard to let go of them. You need to discipline yourself.

Weight loss is one of the benefits of keto. Take a look at the "KetoSchool benefits of Keto" I linked in the post to see all the other good things keto does. I mean it really helps overall health and even nervous-system.