Here you can see 2 ways to hit 1500 calories. Most people aim for 1500 calories a day to start with weight loss, especially to learn where their metabolism is at.
As you can see, it doesn't really matter if you're eating traditionally "clean" or "unhealthy" foods...at the end of the day, calories matter much more. When it comes to weight loss, many studies show that regardless of high-carb, low-carb, keto, high-protein, etc, so long as there is a caloric deficit present, weight loss is consistent and evident.