SONY BBC EARTH HD

Six Brits who are living with obesity are off on a jaw-dropping world tour to lose weight. The group throw themselves into Japan's national diet, and Russ strips off for a Sento bath.

This is TV Show - Travel Category.

Gregg Wallace visits a historic pencil factory in Germany and discovers how they produce 600,000 writing implements in a day.

Steve finds out which predators have the best weapons on earth, from squid with giant tentacles to free-diving crocodiles and a silent owl assassin.

Steve Backshall goes into the dark depths of seas in order to find seahorses and later, explores numerous species of tigers.

People living in Alaska talk about their daily struggles and explain the different techniques they use to survive in a sub-zero-degree environment.

On the eastern coast of Australia, Sanjayan explores mangrove forests in order to acquire a better understanding of blue carbon.

Joanna is in awe as she explores Tbilisi, a place that has preserved its rich heritage even after suffering some devastating blows of wars. Later, she visits Azerbaijan.

Gregg Wallace travels to York in order to discover how one of the world's largest chocolate factories produces a staggering seven million bars a day.

The hosts visit some of the biggest food production units in Britain and share details about the various processes that take place inside these factories.

Will Robson Green achieve the goal of reeling in three different species in a single day as he takes part in the Shark Grand Slam of San Diego?

Six Brits who are living with obesity continue their fact-finding global journey. In Tonga, the group meet the crusading Ofeina and reluctantly embrace the traditional raw fish diet.

The filmmaker explores the journey of the mighty Zambezi, Africa's wildest river. It floods across endless plains, fueling the migration of 30,000 wildebeests and turning villages into islands.

Joanna Lumley travels to Iran where she delves into its ancient architecture and rich culture as she uncovers the influence of Persian Empire in shaping the nation.