1. DAIRY: In order to produce milk for human consumption, cows are kept almost continually pregnant: with unwanted calves sent to slaughter. There are a few organic companies such as Barambah Organics who care for all calves on their farm. Alternatively, limit your intake.

2. SEAFOOD: Rethink tuna. Purse-seine nets are a common way to catch tuna - many are so big they could fit several jumbo jets in them, so they catch a range of other species too, such as turtles, dolphins and sharks. Greenpeace has approved Fish 4 Ever canned tuna, caught by pole-and-line methods, which prevent by-catch.

3. MEAT: Animals in 'factory farms' live in cramped conditions where they cannot move, eat or sleep naturally, so opt for free-range.  Certified organic farms must also adhere to strict animal welfare standards, which ensure they are comfortable and treated humanely.

4. EGGS: Just because your supermarket eggs are labelled free-range, it doesn't mean they're produced ethically. Large factories roughly handle the young chicks through conveyor belts, with an estimated 10 million male chicks in Australia being ground up or gassed each year because they won't go on to produce eggs. Opt for eggs from a small, local, trusted supplier or get your own chickens.

5. VEGETABLES: Organic is always best. More than 98 per cent of the insecticide sprayed on plants ends up in the air, water and soil.  According to a study by the National University'of Singapore, up to 25 million workers in developing countries suffer minor pesticide poisoning each year.