Food prices are just one part of the cost of living in a country, there are other factors like rent, utilities, transportation and so that should be included when calculating the living expenses for each country. The problem with that is it's going to be only an average number across many different products and cities in a country. People are very different from each other’s, some like to live in the city centre, while others are fine to live in the outskirts of a city. Other people like to go out to a restaurant a few times per week whereas others prefer to cook at home. I can tell you a bit about my country and the food costs here in Germany. If you are looking for the cheapest meal, you can buy frozen or canned food in the supermarket for less than 3 Euros. During a promotion you might even get the food in large quantities for less than 2 Euros. The problem is going to be the taste and it's not really nutritious. Eating it in large quantities over a longer period of time is not healthy. You could also make pasta with tomato sauce for the same price. But if you are looking for fresh products then price is going to rise quickly. I would say on average a decent meal at home cost at least 6 Euros and in the restaurant 10 Euros.