I'm glad you found something that resonates! I do find it helpful to have certain rules or general practices so that I am not always negotiating with myself.
I need to think about the seconds and also how they are interacting with my dinner wine (I don't always have dinner wine, but I do with pasta, which lends itself much better to seconds than something like, for instance, a chicken where I am having one piece of chicken and one bread product). Do I want seconds or do I just want something to go with my wine? Do I need a REALLY tiny wine glass? I think maybe a really tiny wineglass would be helpful. It works for ice cream! I will check the thrift store next time I'm in. They often have oddments of glassware.
I've been embracing the Abby Langer one dessert a day. What can I say, I am a daily sweets eater and don't intend to change... but I wasn't always sticking to one a day. Now if I have already had a treat and I am hungry after dinner, I make toast or something.
Something worth noting is that "hunger" is typically a product of pattern, not of needing food.
I was reading a biopsychology book last year that was talking about how most diet research makes no sense and our entire understanding of hunger is wonky.
Think of it this way: food is really fucking hard to digest, and eating it is hard on the body. Everyone who has any degree of lethargy or indigestion knows this.
If you eat predictably, your body comes to anticipate the arrival of food and prepares your body for it by modulating hormones, churning stomach acid, etc. It's bracing for incoming food. This actually creates the aching we have been taught to interpret as "hunger."
Yes, you need food to feel better when this "hunger" roils up, but that's not because you need calories or energy, it's because your system braced for the food it expected thanks to your patterns of behaviour and if you don't give it food it's like "what the fucking fuck???"
This is why most people get hungry about half an hour before they normally eat and just keep getting steadily more hungry, to the point of feeling like they're starving if they go past their usual eating time.
So people who condition their body to expect evening snacks after dinner do genuinely feel like they need food, but only because they're created the anticipatory response that the body will get food.
This is why people who give up snacking don't get hungry between meals or after dinner, because their bodies have been conditioned not to expect more food shortly after eating a meal.
In short, tummy "hunger" is a conditioned, modifiable response that is totally unrelated to any need for calories. It's a pattern of preparation for food that we train our bodies to perform on schedule.
This is why people who adjust to intermittent fasting stop feeling tummy hunger between meals.
I was eating once a day and constantly shifting my meal times around so that my body literally never anticipated being fed. This meant I never felt hungry while fasting.
I felt INSANELY hungry if I took a bite of something though, because then the prep system revved up and knew food was coming. If I decided to start eating I would have to "prime" the system with something easy to digest, maybe a small piece of bread. Then I would wait 20 minutes while the engines revved and I would feel that tummy hunger fire up and by the time I felt like I was ravenous, I knew my digestive system was ready for a volume of food, because I had conditioned it to expect ALL of my calories for the day in one meal.
If I didn't prime the system and just dumped a day's worth of calories into a cold digestive system, I would pay for it, dearly, for hours.
By eliminating the scheduled eating, I eliminated the anticipatory revving of the digestive engine, and therefore never felt hungry until and unless I was ready to feel hungry.
So "I feel hungry" is best reconceptualized as "my body is expecting food."
Human bodies are hardcore pattern machines. We tend to perceive those patterns as drivers of behaviour because they are automatic, but they're actually the product of habits. Whatever you do normally is what your body will arrange itself around doing.
If you snack at night, your body will rev itself up for food at night. If you have one dessert a day, your body will crave that dessert every day. If you eat 6 small meals a day, your body will prepare frequently for small amounts of food, anything else will feel awful. If you eat one large meal a day, your body will do other shit all day until it gets the signal to prep and then it will prep appropriately for a giant pile of food.
If you eat vegetarian, you might crave legumes and meat might give you indigestion. If you eat primarily meat and potatoes then might crave meat and potatoes and beans might give you indigestion.
If you reverse those diets, you will reverse those reactions. I used to eat huge amounts of meat multiple times a day. Beans made me gassy. Then I ate mostly beans and meat makes my intestines furious if I eat it too often.
Now I'm back to meat because family are cooking for me and after 6 weeks it was fine.
I had a hardcore sweet tooth and craved sugar like a hummingbird. Then I stopped eating sugar and it started making me feel horribly sick. Then I quit alcohol and ate sugar every evening and went back to craving it like crazy and had no problem digesting it.
The body will build a neuro/hormonal modulatory system to adapt to whatever pattern it's exposed to. It will make that pattern feel like the only pattern that works for that body, because in that moment, it is. But those patterns are all eminently modifiable.