I used to eat out at lunch every day. Just usually fast food or a pizza joint, but not at home anyways.
About 8 months ago I made a significant switch to eating lunch at home (it is just doable for me if I plan really well and have everything prepared already). It has helped my diet anyways. Interestingly, I haven't noticed the impact on my budget as much as I would have liked - although my dining budget is way down, it simply got offset to my grocery budget.
As for dinner I aim for once a week. But the last month or so I have usually ended up closer to three nights a week out.