Michael Greger

High levels of stress can lead to weakened immunity, rendering animals much more susceptible to disease. This makes the average poultry factory farm a hotbed for outbreaks of avian flu.

Don't forget that fruit can be cooked - think of baked apples, poached pears and grilled pineapple. But if you like drinking fruit, blending will preserve more nutrition and fibre than juicing.

One of the worst things you can do if you're worried about breast cancer is to cook beef, pork, fish or poultry at a high temperature - which includes frying, grilling and roasting.

One in six people suffer depression or a chronic anxiety disorder. These are not the worried well but those in severe mental pain with conditions crippling enough to prevent them living normal lives.

For my diet, I choose mostly organic. But in general, I am a big believer in trying to strike a balance with everything.