I have tried them and found they are ok. kinda help as a reset for your appetite. The 1st 3/4 days are always the hardest.
L-cartatine and 5 htp are also worth investigating. 5 htp is an amino acid that helps curve sugar cravings from carbs and help with sleep.
Keeping busy helps, portion control is hard to start. drinking a glass of water 10mins before eating helps to make you feel full to start. but you need to beware of the midnight munchies that hit when starting this kind of work