A target macronutrient ratio can be a good place to start, but keep in mind that the macros that work best for you and your lifestyle may differ from what works for someone else. The key is to keep carbohydrate intake low, protein moderate, and fat moderate to high. Have fun with it and tinker with your diet until you figure out what is optimal for you. Once you have individualized the diet to work best for you, and after you have been on it for a while, you will learn what you should and shouldn’t eat to maintain your optimal ratio, and therefore you may not need to count macronutrient content as strictly.