I quit alcohol, carbohydrates, weed, porn and tobacco two and a half years ago at age 42, a few weeks after breaking my clavicle in complicated ways, and while checking for additional damage, a fatty liver was identified.

I never picked up alcohol, weed, porn and tobacco and reintegrated sugar in reasonable amounts, like at social events.

I did it cold turkey. One day to the next. It was absolute hell for three days. I was sick, had a fever and malaria like sweats. Then it was a psychological shitshow for two weeks.

I was overweight, so I fasted completely for six days to withstand any temptations. Only had salt and water / electrolytes. After six days I had eggs and sardines for two weeks or so. Didn't poop for almost a month, even had a colonoscopy to check. Everything was fine. Just adapting.

Then I did keto for a few months, found that to be too complicated, and then went carnivore with social-event exceptions, and never looked back. Keto was fine, but being a carnivore changed everything. All my little ailments went away. Skin issues, scalp issues, rashes, moodiness, sleepiness, urges and cravings, all of it.

Lost 12 kg in those first two weeks, barely slept, but was energetic like hell, only skipped work when having the fever and sweats.

Two weeks of hell, half a year of experiments and two years of a new life. It is like being 20 years younger. I haven't been sick or ill since, either.

Good luck to you.