Do not go longer then 4 hours between meals. It doesn't have to be a big meal just eat something healthy. If you go longer then 4 hours you body will start eating your muscle tissue and storing everything you ate as fat. (Catabolic state)
Do lots of Cardio and lift weights. With the weights do fast speed reps to help your fast twitch muscles.
Spend lots of time on speed bags.
I used to box and i miss it.