So your father has gone low carb? How does he like it?Everybody's different and it is harder for some people to give up certain things. Some people have to quit cold turkey.
My father has been gaining weight consistently for 30 years. This year the doctor told him he needed to lose weight or he was at risk of dying. That scared him enough that he immediately gave up all carbs and sugar; it's been three months and he's lost about 40 lbs. For him, eating a single non-diet food would be the same as giving up. He can't do things half-way, or he won't do them at all.
I'm sort of like that too. Once I fall off the wagon it's easy to lose momentum. When I used to smoke, I never let myself have more than one per day. That worked for me because I knew I had something to look forward to. Attempting the same thing with alcohol failed. I kept drinking too much, and then NEEDING to drink. My brain was programmed to start drinking after work; I had to make myself start later and later, until I was only drinking right before bed, and drinking less. Eventually I switched to weed and herbal tea, which was surprisingly effective. I still have to be careful around alcohol, but I don't need it like I did before. My new ritual involves reading and too much tea .
I don't know if any of that helps. Solidarity forever! No one can tell you what will work for you, but know that people are rooting for you. The important thing is that you recognize a problem and want to stop it!
Have you ever done shrooms? They are not addictive and can be excellent meditation-assistants. I heard someone describe it as: Your thoughts and patterns form pathways in your brain like a well-worn trail or a river. It's hard to get off those trails after you've gone down them so often. Psychedelics are a way to get off the beaten path and help you change your habits.