a little of what you fancy does you good
The phrase "a little of what you fancy does you good" implies that indulging in small and enjoyable pleasures every now and then can have positive effects on one's well-being. It suggests that moderation in pursuing one's desires or indulging in pleasures can be beneficial or refreshing, rather than feeling deprived or restricting oneself excessively.
English is confusing! Why do people say "Pardon my French" when they are speaking English? Because of idioms!
An idiom is a phrase or expression that usually presents a figurative, non-literal meaning attached to the phrase. Does that sound fun? It can be!
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