The latest research shows that 30% of all cancers are cause by a bad diet - shockingly that's about the same amount as smoking. Of course, you'll have hears lots about the importance of eating a wide variety of healthy foods, but which ones really prodtect you against the big C, and why?

7 - Green Tea
Green tea is the number one liquid cancer quencher. Unlike your builder's brew, it's a great source of catechins, which have been found to inhibit skin cancers, breast cancers, lung cancers, oesophagel cancers, and colorectal cancers. Of all anti-cancer substances tested, the catechin EGCG has been found to have the most powerful impact on tumor growth by cutting off their food and oxygen supply.

ARM YOURSELF: Not all green teas are created equal. Studies suggest Japanese green teas contain more anti-cancer compounds than Chinese teas. You also need a little patience to get the full benefits, as tea that's brewed for five minutes or less only has a fifth of the catechins of tea brewed for 8-10 minutes. Drink three cups a day and space them out to keep your supply of cancer fighters continually high. (Try Clearspring Organic Sencha Green Tea. £2.69 at Watirose and health food shops.)