If you want to be healthy (and even lose weight), 'Eat mostly above-the-ground vegetables,' advises Daniel O'Shaughnessy, co-founder of detox centre Bodhimaya. 'I divide vegetables into two types - those that grow above ground, which are mostly leafy, and those that grow in the ground, such as carrots or potatoes, which are more starchy. Focus your diet on the above-ground ones and you will lower carbohydrate and sugar levels.'