Has anyone successfully lost weight using only diet, without exercise?

Hello. I am planning to start a diet, but I am concerned because I don't have much time to exercise. Since I spend most of my day sitting down due to work or school, it is difficult to exercise regularly. So, I am planning to try losing weight primarily through diet control, and I am curious if there are any people who have actually succeeded without exercise.

Currently, I am trying to cut down on carbonated drinks and late-night snacks, and avoid overeating. However, I am worried because I have heard that it is difficult to lose weight without exercise. I have also heard that even if I lose weight, I may experience a decrease in muscle mass or easily regain the weight.

For those of you who have successfully lost weight solely through diet management, how did you structure your meals? I am curious to know how much weight you lost and whether you had any difficulty maintaining it. Please share any advice regarding key points to pay attention to or methods you recommend when dieting without exercise. Thank you!