Okay, this is crossing into territory that makes many people (Americans especially), uncomfortable. We eat too much. Overeating costs money at the grocery store, at the clothing store and at the doctor's office. Practicing reasonable portion control will still leave you satisfied, but decrease your bottom line in all three areas. Another aspect of portion control is what you leave on your plate. Most people scrape what's left on the family's plates into the trash - basically throwing money away. Try putting less in the plate - maybe half to 2/3 the amount to start and if someone needs more - okay, then get more, if they don't, that's 1/3 to half not wasted and the money not tossed away. You may end up with more leftovers, but that's okay, you either already have a head start on dinner another night, or you can plump up your freezer's meal reserves.
Cutting food waste cuts money waste.