Cutting back is the best thing then for you, and making things from scratch as then you can control the amount of sugar that is put into things, it is harder if you do it all at once, if you just keep using a bit less you will be down to using next to none in no time, Same with greasy fatty things,
Even cutting down on your portion size a bit will have an effect. Your body is used to having so much, that if you cut back slowly you won't notice and won't be feeling hungry even if you are eating less.