Lay Off the Carbs.
Carbs are bad. Where have you been under a rock? ElPetro?
A small amount of carbs before you do your cardio is fine but stay away from them after and eat a large amount of protien.
Protien=Muscle
From personal experince on a high protien diet I have lost weight, gained strength and muscle mass.
Drink lots of water.
Where do you box?
All the world's a stage,
And all the men and women merely players:
They have their exits and their entrances;
And one man in his time plays many parts, ...
William Shakespeare
"As You Like It"
Act 2, Scene 7