In my case it doesn't. Sure I know what is way too much or way too little, but without somehow counting calories (in my head or in the app) I couldn't tell you if I ate just the right amount or maybe 100-200kcal on top of that. And over the year that would result in a huge weight gain. Sure, I could diet as soon as I see the weight gain, but for me it feels better to simply track my calories. I've been doing so for 6-7 years now and I feel good with it.