Heat-and-eat food is ready in an instant and canning process means no preservatives.
Eating food from a can takes no time at all. Put it in a saucepan or in the microwave and you have a meal in minutes. Canned food has the advantage that it is preserved by the canning process, so usually there is no need to add preservatives into the mix. And I would much rather eat a canned soup or meal like this than resort to reconstituting chemicals from a packet.
Tomatoes (60 per cent)
Any product with lots of tomatoes in it is going to be good for you. Tomatoes are high in lycopene which has been the subject of many health studies which claim that a high intake can help reduce the incidence of cancer, cardiovascular disease and macular degeneration. However there is no firm evidence this is the case. And the studies concentrated on tomato intake rather than lycopene supplements which means that the other nutrients found in tomatoes such as Vitamin C, folate and potassium might be giving benefits rather than the lycopene. One thing everyone agrees on is that tomatoes are very good for you and a good vegetable choice.
Ravioli (25 per cent)