Don't throw away great health!

Some of the most common kitchen toss-outs are often packed with nutrients even more potent than the ‘main’ foods they come from. Here’s how to harness their benefits

- Ann Green

Lower blood pressure with onion skins 

They have 77 times more quercetin than onion flesh, Korean research shows. And a study in the British Journal of Pharmacology suggests increasing daily quercetin intake lowers systolic BP (the top number) by up to 18% and diastolic (the bottom number) by up to 23% in five weeks. Simmer the skins in soups or stews to release their quercetin, then discard.

Beat the blues with citrus peels

Orange, grapefruit and lemon peels brim with