I think planning and sticking to it is vital, you don't need to spend a fortune. Go to Aldi and buy loads of fruit and veg make a big pan of nice hearty thick veg soup, (I'm going to make a slow cooker full of spicy butternut squash soup today) I also buy whatever fruits cheapest, chop it up and make a big bowl of fresh fruit salad, add a little sweetener and keep it in the fridge to snack on and have as dessert and on my cereal, aldi big pot of fat free plain yoghurt is less than 50p and you can eat it with fruit or add it to soups and sauces to make them creamy. Good luck