Which is better to reduce carbs gradually, or all at once?

It has been shown that people are more able to make permanent changes if those changes are small. Then, when the new habit has been formed,  Another reason to avoid eliminating too much carbohydrate at once is that some not so good symptoms can occur in the first few weeks  as the body is adjusting to using fat for energy rather than carbohydrate. You usually experience what is known as (keto flu) or carb sickness ) which will last a few days in most cases .(I have more info on this in other blog' what is keto flu')                                     The approach favored by popular diet books featuring low-carb approaches such as Atkins and south beach diets is to reduce carbohydrate a lot at the beginning, and then gradually raise the amount of carb until negative effects occur, such as: weight loss slows, blood glucose control lessens, blood pressure rises, cravings return, etc. The main negative of this are that there is a large change in eating to get used to all at once.