$437 avg over last 3 months for 3 including groceries/toiletries/household/school lunches but not dog & cat food

That would be $145 per person.
Usually we spend $150 going out to eat however during the last 3 months we have forgone that to spend money on fixing up the front yard - our grocery bill went down during that time not up

It's been a process for me though with the grocery bill creeping down over the last few years. For example, last year at this time the 3 month avg was $545 or 181/person.
Some of the changes I've made (over several years) are:
Making a list of what we actually use (vs. the yummy looking (or cheap) stuff that just goes bad)
Watch the ads so can buy what's on sale.
Stock up when price is low.
No impulse buying (ok to buy a "deal" for something that's on the general list)
Use coupons (utilizing free online resources like couponmom/hotcouponworld)
Follow a local blog to catch other "deals" (originally followed regional ones until found the local one)
Make a spreadsheet of items bought that calculates the average price (to see the real deals) - print out the avg price list so can check at store
If already have plenty don't keep stocking up (unless it's free w/coupon

)