It certainly helps to have a caloric deficit, but it's just as important to increase your intake of quality protein, good carbohydrates (especially vegetables), fibre, healthy essential fats and water. For the majority, the bottom line when it comes to getting leaner is eating less carbohydrates (less than 150 grams daily) and eating more protein. And if you want a body that functions at a high level and looks lean, you are going to need a multi-vitamin/minerals supplement, too.