If you eat more calories than you expend you will gain weight, if you eat less you will get hungry.
I don't subscribed this in vs out stuff.
For the very overweight, smaller portions will make changes and to always stay a little hungry Is the ticket.
But at the end of the day, the idea is to keep the goal, the goal.
Training is not not a beginning, middle and end...we need to make continuos improvement, with adjustments and variations.
As noobs is suggesting...get to know your body you'll have to live with it for the rest of your life.
Some can go through life eating what they like, for those that cannot it will take a little longer and will need to work harder.
A person with years of programmed overfeeding ?
I think counting calories is a tool to reset bad eating habits and set a benchmark.