Are there any foods that have not at some time been considered harmful in a study?

The long-running series in which readers answer other readers’ questions on subjects ranging from trivial flights of fancy to profound scientific and philosophical concepts

Are there any foods that have not at some time been considered harmful in a study? Tony Clancy, Malvern

Post your answers (and new questions) below or send them to nq@theguardian.com. A selection will be published next Sunday.


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