They're the difference between losing, maintaining or gaining weight, however, understanding what they are, how much you need, and even more challenging, how many you're actually eating, is a nightmare.
The trick is to not get too bogged down on the exact numbers you read when it comes to calories. Paying no attention to them at all can also be problematic.
This episode is designed to give you the basic understanding you need to make informed choices and meet your health goals, whatever they may be.