You can just grow your own fruit and vegetables in your very own back garden. Not only do you get the food free it also reduces travel cost however at the same time it is still healthy. You can grow a variety of different food in your garden and it is very cheap to grow.
Buy loads of fruits and vegetables in farming season as this will be the time when the cost of fruit and vegetables will be at its cheapest in supermarket. Leave extra foods in the freezer. You can eat frozen fruits and vegetables in winter when the prices of fruit and vegetables are high. When they are in season, buy fruits in quantity and freeze any extras. You can buy several pounds this way, and freeze extras to have them when the fruit goes out of season.
Try to reduce the amount of food you buy from fast food restaurants as it is high in fats. Also buy fewer sweets and try to control yourself