High carb diet's will give you plenty of energy.
Lots of pasta and potatoes, stuff like that.
As i've started working as a chef now, i realised i'm getting once again unfit due to picking on food at work. Even though most of it's cucumber..
Drinking lots of water helps as well, you can burn calories drinking ice cold water, because you use energy heating it up in your system.
Doing something simple as
This daily can help you a lot.