Earlier quoted context omitted.
How long is "eventually"? My cat is almost 5 years old. She is the type to overeat to obesity, probably because she was abandoned at ~1yr by her previous owner. For half her life my partner and I have been feeding her like clockwork 3 times a day, minus all of 2-3 weeks of vacations where our roommate took over. I have to exert a constant effort to maintain our bedroom door and the rubber that I lined on the jamb to…
My cat was on a "diet" similar to yours. I just ended up giving in and letting him eat all the food he wanted, which ended up being less than expected. He just freaked out at having an empty bowl. He's a very big strong boy now (20ish pounds) and is just very happy. My thinking was that he's a cat and what's the point of a cat being unhappy for his whole life.
We really had to push the weight loss because it was clear she wasn't meant to be so big. Her asthma was significantly worse when she weighed more (multiple attacks a week vs now I don't even remember the last one within the past year), and there were huge patches of her body covered in greasy dandruff because she couldn't groom herself. It would have eventually led to a lot of problems. Better for us to put up with her antics than to watch a painful death, really.