I've definitely seen that first-hand. A girl I dated years ago started counting calories but not including the 3-5 cans of Coke she drank each day, or sometime

I've definitely seen that first-hand. A girl I dated years ago started counting calories but not including the 3-5 cans of Coke she drank each day, or sometimes she'd only record one or two of them. I tried to point it out, and she insisted she only drank one or two cans/day and they were recorded. I pointed out that we bought a 12-pack of Coke on Sunday, and it was now Tuesday and there were only 2 cans left, so do the math, because I wasn't drinking any of it. Or she'd buy Oreos and snack on them while gaming and after an hour not realize she's eaten a third of the package. I don't think she was serious about wanting to lose weight, because anybody really wanting to lose weight probably wouldn't be buying Coke and Oreos. A single can of Coke and 3 Oreos is 300 calories. That's half a meal's calorie budget for someone trying to stick to 1800 calories/day with 3 meals/day.