Personally, this is why I include "treats for myself" into my schedule. And I don't just mean working a slice or two or pizza into my 1200 calorie day. But I can't trust my own judgement. If I've been on 1200 for 3 months and walk past the bakery aisle in my grocery store it's too easy to think: "Oh well I've been good so I deserve a cheat day." And then continue on to think the same thing every other day.

So instead I plan out the specific conditions needed to for cheats and treats. It can either be tied to a chronological standard or to a goal I need to meet. For example I can have a cheat day every other Saturday, every first day of the month, on special occasions or whatever works for me. Or goal-wise it can be when I hit a certain weight, when I've hit a streak for X amount of days, when I've been on the plan for X amount of months, when I've hit a fitness goal, a work goal, a personal goal, etc.

However what the "treat" will be and what the conditions are, whether time-based or goal-based, is always decided beforehand. Preferably when I'm not hungry. It's so much easier to stick to the rules if a reward is on the horizon.

This is why I used to do calorie cycling. weekdays were 1200, weekends 1800... average weekly 1370. If there were special occasions I would use one of my 1800 days but add a 600 calorie bonus on top. So on a week with a special occasion my average would be 1457 (12005 + 18002 + 600) still below my TDEE.

However what was a special occasion was always decided on beforehand. It's way too tempting to just go: "Oh well I've had a really hard day so it's a special occasion" or "Oh well I'm on my period so..." or "Well it's constitution day in Norwegia!" (I'm not Norwegian, nor have I ever been there...)