Firstly, it's not a 1200 calorie diet. You have a 1200-1550 range on Spark, that is the minimum range. So 1200 is the absolute minimum you should eat every single day. It is not the goal. The goal is somewhere in the middle. So try to think, if you work better with one number, of 1400 (midrange) as the daily goal, not 1200.
Eating cheeseburgers is always a poor nutritional choice, but boy, don't they taste good?! :)
You will have times where you make healthy choices and times where you make poor choices. Your success at weight loss will come from making healthy ones at least 80-90% of the time. That means there's absolutely room for some poor nutrition choices. We aren't perfect, and we shouldn't expect ourselves to be!
Just make sure it's 10-20% of your eating that's poor choices, not every day.
And please make sure you eat enough at your other meals today. If that was lunch, for example, do NOT skip dinner because "that would put me over 1200 calories". First off you've got that whole range, so you have 1,000 other calories you can eat today. And second when we make poor nutrition choices we may have to accept that that choice made us higher than range today. It's far worse to follow one poor nutrition choice (junk food) with another one (skipping meals) than to just have a light but filling evening meal anyway and end up over the calories.
Besides, if you end up, say, at 1700 calories, that is only 150 over. If you eat 1500 for the next three days that balances out and over the four days you were "in range".
Deb, in New Zealand