Because you are more prone to pay attention to what you are eating.
Once you know calories counts of food, you make wiser decisions. You say to yourself "I'm gonna have an apple for a snack for 100 calories, as opposed to a snickers bar for 225, and 15 grams of fat".
It also helps you form decisions on meals, once you know how many calories you have already consumed. Say it's dinner time and you have eaten 900 calories for the day, and your goal is 1500. You can choose to have grilled chicken and brown rice and greenbeans for 500 calories and very low fat, or lasagna for 900 calories and 35 grams of fat.
Does that make sense?
Tracking helped me lose my first 25 pounds alone - no exercise, so yeah...it works - well, it does for me.
Now I'm doing maintenance for a bit - and I don't track - but....I'm eating basically the same foods I've been eating all along - so I know off the top of my head pretty much the amount of calories, fat and carbs I am eating every day - but I would have never known those numbers, had I never tracked for all those months.
Renataruns is a member here (the only one I know off the top of my head) who never tracked, and she has had good success - so it's always interesting to hear her take on tracking.
The best exercise in the world is to bend down and help someone up.
| current weight: 111.0