Obviously the first part of change is the desire to change, and for some people that desire is strong enough to implement changes and break habits. But, for some people, the "habits" are not psychological.
I thought I was a lazy, depressed mess. No matter how I fought it, I couldn't break my "habits". Oh, until I went on medication for a hormonal imbalance, and found a woe that works for me The difference in myself is like day and night. I finally have the energy to be the person I've been fighting to be for all these years.
If will power was all there was to it, I would have been that person a long time ago.
"I think the basic anti-aging diet is also the best diet for prevention and treatment of diabetes, scleroderma, and the various "connective tissue diseases." This would emphasize high protein, low unsaturated fats, low iron, and high antioxidant consumption, with a moderate or low starch consumption.
In practice, this means that a major part of the diet should be milk, cheese, eggs, shellfish, fruits and coconut oil, with vitamin E and salt as the safest supplements."
- Ray Peat