Grapefruit and grapefruit juice can interact with a number of medications, either making them work too strongly or causing unpleasant side effects. The juice is generally singled out over the fruit because it's concentrated and easy to consume a lot of grapefruit - one small 200ml glass is the equivalent of 2 or 3 grapefruit.

Grapefruits get the thumbs up from every nutritionist, myself included. I love to kick off my day with a pink grapefruit that I peel thickly, cut into segments and add a thin sprinkle of brown sugar. Nothing nicer before my muesli!  Like other citrus, grapefruits are packed full of vitamin C, providing an entire day's needs in just half an grapefruit. This vitamin can enhance iron absorption, speed up wound healing and reduce the risk of a heart attack.

Do you love to sip a freshly-squeezed juice of orange, carrot and wheatgrass? Or grab a mango and yoghurt smoothie as a quick lunch-on-the-run? Juices are healthy and fat-free but they're a trap for the health conscious. Read on to find out why ....