Yeah, it depends on your definition, for sure

.
It's pretty hard to eat enough spinach to do any damage. Leafy greens are always my go-to when I'm feeling like I could eat a horse and just want to munch.
On the other hand... "whole grain" is pretty easy to overeat on. You have to pay attention to the calories there, even if it's considered healthy.
But, yes, that's the concept

. Eat healthful things in the right proportions and you will lose weight. You're doing great!