The first days by far hardest!!
Play about with the times you eat add a little piece of fruit if thats what it takes for you to do it.
Eg fruit morning (extra)
Shake 10am
Snack 12 pm have soup spaghetti etc so you feel you have eaten
Shake 2pm
Snack 4 pm have something filling rice cakes and jam tin tuna cereal porridge
Tea 6pm 600cals
Evening snack have something yummy that you look forward to all day like a bag of crisps choc biscuit 100cala
600 cals can be a lot for tea worst case have 500cals and porridge in the morning 100calI dont have children but i suppose your up longer then me!! Obviously this is not what it recommends this is my opinion but if the calories are the same .....?
My biggest tip though is play about with the times you eat , have you biggest meal in the evening as you look forward to it! Stick with it even for a week and see the scales! Oh and lots of water. X