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Try to have a pantry week once week a month, in which you do not do any grocery shopping and instead just rely on what's in your pantry. Use leftovers, frozen food, and anything else you can find. You probably have more food than you realized sitting around. You can google recipes that only use the ingredients you have on hand that week. As previously stated, many websites offer you lists of suggestions if you type in the ingredients you have. Some foods can be frozen to increase their shelf life. If a bread item you usually buy, like sourdough bread or bagels, goes on sale you can freeze loaves or packages to increase their shelf life. Bread can last about three months when frozen. Most raw meats can be frozen to increase their shelf life. How long they last depends on the type of meat, but poultry, beef, and pork can last for months frozen. If you're big on seafood, buy pre-frozen seafood in the store rather than fresh cuts. Not only does this cost less, you can stock up on sale items and leave them frozen for a few weeks or months before use. It's okay to buy expensive foods once in awhile. However, choose the items you splurge on wisely. Certain foods may cost slightly more, but this is because they're healthier. Whole wheats, for example, are much healthier than processed wheats. This means you'll end up using less of these items as you'll feel fuller faster and for longer periods. Some organic foods may actually fill you up more. You can experiment with going organic on certain items, usually wheat or grain-based foods, and see if you notice yourself eating less. If so, you might want to try swapping certain foods for the organic variety as you may end up spending less over time.
Have a pantry week. Freeze certain foods. Choose splurge foods wisely.