FACTUAL

Channel 4, 8.30pm

Did you know that jelly won’t set if you add chopped papaya to it? Or why homemade ice cubes are always cloudy but shopbought ones are clear?

This is the fact-filled consumer show that reveals secrets about the food in our supermarket trolleys. And the presenters trot all over the globe to gather their evidence.

This time Jimmy Doherty is in South Africa where he discovers the magic ingredient in papaya that not only helps tenderise meat but could also help the human gut.

In Hawaii, Kate Quilton visits America’s only tuna auction to find out why some fish have dangerous levels of mercury and others don’t. She also visits a groundbreaking tech start-up in San Francisco which hopes to feed the world by growing fish flesh in a dish.

And Matt Tebbutt investigates the ice-cube conundrum. They are all made with tap water, so what’s the trick? HEALTHY INTEREST Host Alex