The diet for obtaining a lean body is different from person to person. The main purpose is to build muscle mass and eliminate the fat. You need to find out the diet that works for you and not just follow the diet your friends or colleagues are following.
The diet for a lean body should basically have high protein foods and complex carbohydrates. Muscles can be built effectively with the help of high proteins and carbohydrates will provide you with the energy you need for your workouts. You will need to take a little quantity of fat also but they should be healthy fats. Healthy fats are essential for producing energy and having healthy nails, hair and hormones.