The humble plum isn't just a cheap fruit - it's a potential lifesaver as well. Having just one a day could help prevent against breast cancer, heart disease and even slow down the ageing process, according to a study by AgriLife Research in Texas.

Plums contain higher levels of antioxidants than blueberries despite the cheaper price tag. They also help you see in the dark and keep the skin young thanks to their high levels of vitamin A, while remaining fat and cholesterol free and low in calories.