How much is reasonable to spend on food?

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One of my New Years' resolutions is to spend less money on food, waste less food (and also to eat less of it); and therefore to save money. I always overspend at the grocery store, and eat out way too often. I end up throwing food away because I don't cook it before it goes bad, too.

I may have already asked this and forgotten, but how much is a reasonable amount to spend on food? For one person, per week (or whatever increment you wish). A generous amount (not bare bones); with maybe, once per week eating out. I have no idea, really, so I thought I'd ask y'alls' opinion.