If you've made the New Year's resolution to get fit and lose weight, exercising alone isn't going to cut it.
In any healthy weight loss regime, eating the right amount of calories and nutrients is essential. Eating too many calories will make losing weight much harder, and eating too little won't give you the energy you need.
Knowing the amount of calories you should be eating and keeping track is a great way to ensure you're getting enough, and to help, Michael Mosley has explained the importance of tracking and how you can do it.