What are the fewest separate foods you could eat and still have a healthy, balanced diet? Nancy Bamber, Ottawa
Post your answers (and new questions) below or send them to nq@theguardian.com. A selection will be published next Sunday.
What are the fewest separate foods you could eat and still have a healthy, balanced diet?
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