Expenditures = Budget?
Where budget and expenditures are equal to all fixed and variable expenses?
Food budget for me works out to be roughly 10% of our combined income, with about 3-5% on top in eating out. It varies by about 3% (both do).
Cutting down is actually pretty easy, if you are very serious about it. Simply buy and cook in bulk (this helps if you are working - stuff like stew, roasts, chilli, etc are easy to freeze/refrigerate for lunches). Don't eat out for dinner - and if you want to lose weight at the same time, go very basic - meat and potatoes basic, if you will. Not only is it healthier, but you'll convert the money you spend otherwise into good food, although it may be somewhat more expensive. Simply buy greens/vegetables, a hunk of meat, some carb (potatoes, rice, etc). Eat fruit for breakfast and/or desert - apples are best in the morning since they can replace coffee.
In general, eating well isn't expensive if you do it right - in a way, it is a lot less expensive than eating out and/or doing fast food at home. It isn't "ramen" cheap, but it certainly is doable for anyone not on a shoestring diet... and your body will thank you for it too.
(Or so I hear. I've been bad the last few months. Time is a concern )