The body does not need exogenous carbohydrates, there is no such thing as an essential carbohydrate. Carbs are a useful tool but they are also easy to abuse.

The body is perfectly capable of deriving carbohydrates from essential fats and essential proteins.

Beyond the physical addiction there's also a lifestyle addiction, this is a similar problem chronic cigarette smokers who want to quit encounter. Sometimes they do quit and get through the physical discomfort of withdrawal but often fall back in because a pavlovian response has been built into many experiences like socializing, hanging outside and chatting, having a smoke as a break from severe stress, etc.

Because refined carbohydrates have been threaded through almost every food marketed to people in our society there are second order lifestyle addictions too which require clever environmental structuring, determination, and often times social support to overcome.

Social support is key and is often the failure point for most people. Particularly when engaging non-mainstream methods or ideas. Most people across many different social groups think the idea of self experimentation to be an alien or downright stupid idea.

[Edit] the body doesn't derive carbohydrates, it derives glucose.