Oh, yeah, by the way, he also started exercising... ;^)
This is the way that I've lived my whole life. I've never been on a diet, ever, and I've never been overweight, ever (except for short periods after Thanksgiving or when I return from a vacation to Germany and Italy). I've never felt the need to eat when I'm not hungry and so I don't.
It's all perfectly logical and relates to the concept of satiety, the pleasure gained from eating good-tasting food.
Moderation is the key, and that's the important underlying message. No gorging, no unnatural fixations on eating calorie-free foods when they taste lousy and are ultimately unsatisfying.
I don't exercise excessively, and it's been working fine for me for the past 40 years.
Lift weights.
Behold the hard part.