Can you still lose weight if you eat a low amount of calories (like 1,000-1,500 a day) but its not in healthy food?
Yeah, you can still lose weight. I don't really think it would be for the best though. It's important to pay attention to the nutrition of the food you're eating. Yes, regulating your caloric intake is important, but so is maintaining proper nutrition.
Eating foods that aren't so healthy doesn't necessarily mean you will gain weight. But, it doesn't necessarily mean you'll lose weight either - even if you consume 1,000 to 1,500 calories per day.
The nutrients contained in the food you eat indirectly affect your ability to lose weight. For instance, sodium not only causes you to retain water, but it also makes you thirstier. And, if you are thirsty, you are more likely to drink more liquids. And, unless you are drinking nothing but water or zero calories drinks, you're going to be sucking in more calories than you think. Not to mention, it's bad for your arteries.
Each nutrient has its own affect on your body. So, along with watching your calories, pay attention to the nutrients.