Any newly introduced diet might have a short-term positive effect on a person. It's due to our body going into a shock and coming up with an emergency plan.
Just like during a flood or fire, we start talking to our neighbour for the first time, and working with them in sync, when a new diet is introduced body goes into an emergency and develops an SOS plan!
A short-term diet is to achieve a specific result. But, due to this contextual positive result, many people think this specific diet is ideal for long-term use.
I think low-carb vegetables should be around 2/3 of the nutrition for ongoing life. The remaining 1/3 is from protein, fats, herbs, spices, condiments etc.