Good nutrition for a lean body should comprise of carbohydrates and a high protein diet. A good diet is required to build body muscles and it also helps in removing the excess fat from the body. Carbohydrates give energy to the body and the proteins help in building the muscles. Most of the carbohydrates should be consumed in the early hours of the day while refined carbohydrates should be avoided.
For maintaining a good body regime, you should understand that there is no particular diet that will help all of you. So you will have to try different diets and find out which one suits you the best.