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The leaves of rhubarb are high in oxalic acid, which in itself is poisonous - but it can also bind with calcium to form insoluble crystals, which are precursors of kidney stones. People with a tendency to kidney stones should avoid rhubarb altogether.
If you enjoy cooking take a minute to look at ‘Simon Scrutton French Cookery Classes’ on Google – and learn how to make top class bistro-style dishes. Suitable for beginners upwards. Small classes.