What Not to Eat

What Not to Eat

Channel 4 Running Food

1 Season · 4 Episodes · Premiered January 6, 2026

In What Not to Eat, award-winning scientist Professor Tim Spector will be helping the UK navigate the baffling world of ultra-processed foods (UPFs), thought to directly contribute to the UK's rising obesity rates.As well as the usual junk food and ready meal suspects, Professor Spector will highlight how seemingly healthy ‘low-fat', ‘low calorie' options are hiding some ultra processed health horrors. He'll then be offering nutritious alternatives and take us back to basics, showing us what to shop, cook and eat in a bid to transform the nation's health.

Where to Watch: Channel 4

Official Site

Next Air Time: No upcoming air date

Seasons & Episodes

Season 1

4 episodes
E01
Episode 1
Tue, Jan 6 2026 8:00 PM GMT+0000 60 min
Professor Tim Spector and GP Dr Kandi Ejiofor help viewers to navigate the world of ultra-processed foods (UPFs), that are thought to contribute to the UK's rising obesity rates. They begin by revealing how some of the nation's favourite ultra-processed foods are made, starting with strawberry milkshake, and investigating exactly what ultra-processed foods do to the body. Tim and Kandi also help Vicki and Rob from Scarborough tackle their instant-noodle addiction and show how making simple swaps and cooking easy recipes can benefit a person's health.
E02
Episode 2
Tue, Jan 13 2026 8:00 PM GMT+0000 60 min
Tim Spector and Kandi Ejio reveal the science behind why biscuits are so moreish and find out how many chemicals are lurking in a simple slice of ultra-processed ham. They also help Nick and Sarah from Cambridgeshire to ditch their sausage rolls and boxed wine in favour of fermented foods, and they demonstrate how to use natural ingredients to make cookies.
E03
Episode 3
Tue, Jan 20 2026 8:00 PM GMT+0000 60 min
E04
Episode 4
Tue, Jan 27 2026 8:00 PM GMT+0000 60 min

Cast

Tim Spector
Tim Spector as Professor Tim Spector
Kandi Ejiofor
Kandi Ejiofor as Dr Kandi Ejiofor

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