While fruits, vegetables and lean proteins can add up, this doesn't have to be the case, according to Koidis.
"The consensus is that it’s better if you go seasonal and local, although it’s always a bit of a challenge when you want it quick and easy," he said. "Go for ingredients that are in season. For example, maybe don't go for strawberries in the winter."
He added that being organised with your shopping and buying large quantities of staple foods like bread, grains, pulses, and legumes which you can cook and store can help you save.
"Most carbohydrates you can reuse quite a few times — you can eat lentils every day, there are a thousand recipes, and you can create five different meals with a bag of sweet potatoes."