Once you get into the habit of eating very little, after about 4 days you don’t feel hungry any more. This is just my experience
I can confirm this (s long as you are consuming enough to sustain life healthily, obviously).
But - there's a catch.
If you just ONCE veer from you scheduled eating times or healthy food choices, then "food lust" kicks in. Your body gets a taste of (say) chocolate non-related to mealtime as a pudding, and it is quite literally like an alcoholic taking a sip of whisky after months of sobriety. It wants more. And unless you fight it again (and it's pretty much like starting all over again) you will find yourself pigging out on all the stuff you worked so hard to stop scoffing. Some foods - sugars, carbs and fats are addictive - REALLY. That is because in nature they are hard to come by, so when you ancestors found a source of these valuable foods, they consumed as much of them as they could to lay up stores of life-saving fat.
It isn't possible (at least not for me) to do "controlled" treats. I can only lose weight by eating set foods, at set times, and any treats I allow myself have to be part of this regime - so, for instance, if we were at the beach and everyone spontaneously wanted an ice cream, I didn't have one because it broke my routine and I knew I'd find it difficult to maintain my food balance.
Re: portions - your stomach shrinks when you don't put so much in at a time, which is why many diet plans suggest (say) six tiny meals a day instead of three big ones.
However, I agree with others - life is too short not to enjoy lovely flavours. I'm overweight but not obese and have kept at this weight for a while. I do like strong flavours and love fatty food (I may be wrong, but I'm pretty sure my blood group is butter). I found limiting carbs the most helpful thing to maintain my weight at a reasonable level.