Name one ingredient in that burger that is unhealthy. Bread? Meat? Cheese? Greens? Half a teaspoon of ketchup? Just check your caloric intake and eat whatever the heck you want.
That amount of downvotes you're getting because fat people hate hearing that "yes, you could just eat a bit less!"
Your bodyweight is 100% correlated to the amount of calories you consume/burn. Eat less calories than your base metabolic rate and you could lose weight on a diet of pizza and just sitting on the sofa all day!