Eating less food on your cheat meal day to make enough room for your cheat meal is a very common dieting mistake.
If you eat less on the day of your cheat meal to make room in your macro allotment for your cheat meal, are you really eating a cheat meal?
No, you aren’t.
All you’re doing is portioning other things out to make room for your junk food meal. You aren’t actually increasing your calorie intake for that day.
The point of a cheat meal is to eat more calories and carbs. Not to portion it so you're getting the same amount of calories you would on a normal day of dieting.
By eating more calories than you normally would, you stimulate and stoke your metabolism.
As you diet and get leaner and leaner and eat less and less food, your metabolism will start to slow down so it doesn’t go into starvation mode.
By intermittently eating a cheat meal on top of your normal calorie intake, you will boost fat-burning hormones and promote a higher level of satiation, reducing overall cravings.
During extremely strict cutting phases, it is more beneficial to have a cheat meal once per week than it is to stick to your normal diet that day.
This strategy is used by many with great success.