@Blueraccoon some ideas-
the difference between enough and too much is very slight.
It's tiring to check every item before it makes its way to your mouth.
Everyone enjoys a treat and our current culture means treats are always around- not saved for special occasions anymore. Alcohol, chocolate, crisps, nuts, sweets- high density foods that side step appetite are permanently available.
I've noticed that one slip leads to many more- I had to stop keeping 'allowed' treats in the house, as one just led to another almost immediately. It's a sugar rush or something. Very chemical, very hard to short circuit.
We have treats in the house (three men wanting biscuits, crisps etc) but they are not mine, they are not 'allowed', so I can ignore them. It's the ones like popcorn bars and kitkats that can fit in the diet plan if you are careful that trip me up.
So those are my barriers to maintenance- other people's will be different. I've got some social events on the horizon, there's no way to have an afternoon tea 'on plan', so I'll have to make up for it all week. I can't stop all the family treats, either- take aways, pub meals and so on.
My main technique is to make sure I do better than I used to. I don't have to be perfect, I don't have to go without, I just need to have less than I would have in the past.
But if my hormones blitz again, or my mental health dips, I'm going to be in trouble because this takes constant effort and attention. When/if I take my eye off the ball, it's likely to go pear shaped!