way of sticking to a diet may be to allow yourself to relax it at certain points. If you eat chocolate every day, and often several times a day, then you’re not going to lose weight. But only a diet fascist will say that the occasional bar as a treat is off limits.
This is not to say that you can carry on eating chocolate as regularly as you wish, or having fried food every few days. For a diet to mean anything, the healthy options have to be the norm. However, a small treat once or twice a week as a reward for sticking to the diet is not going to be the end of the world – and it can enable you to keep to that diet indefinitely, aiding you to lose weight in the long run, which is what you want.