NO! :whoopass: You cant have sweets on a TFR diet!!
You need to either commit to doing a VLCD or if you want to eat, move to WW or SW etc
Why not take a bar with you?
Id have to question the legalities of a bag search at a cinema quite honestly. Thats shocking
Mind you Im sure a bar would have been ok to smuggle in. Just think how good youll feel after the film and youve not broken your diet