​Which is more important: the quantity, or the quality of calories you eat?

Let’s Keep It Simple (KIS)!
If you want to lose weight, you need to focus on the quantity of calories you eat.
If you want to be healthy, you need to focus on the quality of the calories you eat.
If you want to lose weight and be healthy you should focus on the quantity and quality of the calories you eat.
 
How much you eat will determine whether you lose or gain weight. If you are in a calorie deficit you will lose wight, if you are in a calorie surplus you will gain weight. What you eat in this case might not matter as much. For example you could have burgers and chips every day, and once you are in a calorie deficit you will lose weight. However, the problem arises in that the “quality” of foods like burgers and chips is not great. They are processed calorie dense foods. Thus you may not feel great if you eat these types of food every day. If you want to feel great, you need to eat wholesome quality foods.
Bottom line, If you want to lose weight and be healthy you should focus on the quantity and quality of the food you eat.