Plan your shopping in advance and be careful with special offers.
Prepare weekly menus, check what food you still have in your cupboards and only buy what you really need. Choose regional and seasonal products, as they have not travelled a long way and are therefore fresher and better for your health and for the environment.
Some shops offer discounts on food that is about to expire. Make use of it! This way you can help fight food waste and save money. However, only buy these products if you are really going to use them.
Only choose special offers where you pay less by buying more (such as 3 for the price of 2 or 20 % extra free) if you actually need all of it or if you can freeze the product. Otherwise, you will waste money as well as food.