Jimmy Doherty, Kate Quilton and Matt Tebbutt return for a new series, travelling the globe to uncover more unusual, intriguing and surprising secrets behind the food we eat. Jimmy investigates shock reports that changing sea temperatures mean squid and chips could one day replace fish and chips as our national dish. To see what could be in store, he visits Thailand, where squid is a national obsession. He joins the Thai squid fishing fleet to witness a colourful display of night fishing that's so spectacular it can be seen from space. Meanwhile, millions of us take multivitamins every day. Kate investigates where they actually come from, and how much we need them. At Nasa, an astronaut lets her into the secrets of space nutrition. And what gives clotted cream its distinctive yellow colour? To find out, Matt visits the UK's leading producer in Cornwall, and an astonishing algae farm in the desert in Israel.

How much prawn's in a prawn cracker? What's in low-salt food instead of salt? Plus the new high-tech method of keeping fresh herbs alive for longer