Skip to Main Content
Skip to Main Navigation
Skip to Footer
Sign in / Register
TV On Demand
Film on TV
Film On Demand
Radio On Demand
Horizon: Sugar v Fat
Share on Facebook
Share on Twitter
Share on Pinterest
Share on Google Plus
Share on WhatsApp
Email to a friend
As the New Year diet clamour about the evils of sugar rolls on,
weighs in with a brutally simple contribution. Yes, sugar is bad, but so is fat: which is worse for you?
The current furore comes after decades when low-fat foods have been pushed as healthy options, even if stuffed with hidden sugars. But in the US, sugar is increasingly branded as addictive, deadly, even “toxic”, as Doctor Xand van Tulleken, who lives there, can attest.
He and his brother Dr Chris are identical twins and should therefore be perfect for a simple scientific experiment: if Chris eats sugar and carbs galore but no fat, while Xand eats a high-fat, protein-rich diet, who will come out better? Are all calories born equal?
The twins tour the swings and roundabouts of each regime: protein makes you feel fuller, but without sugar your brain struggles under pressure. And of course, both diets look quite revolting.
Doctors Chris and Xand van Tulleken, who are identical twins, go on month-long diets comprising high volumes of fat or sugar to find out which is worse for the human body. The effects on their health are both shocking and surprising, but they also discover their biggest enemy may have been hiding in plain sight.
Full Episode Guide
What's it like to battle with a dozen people talking inside your head?
This week’s Horizon looks at the lives of three people who have been diagnosed with conditions that feature hearing voices, paranoia and hallucinations
BBC may lose the right to make long-running science series Horizon
8 hair care myths untangled
The contradictions of drugs in sport
Jimmy Carr to host Horizon special on the science of laughter
To vape or not to vape: are E-cigarettes a miracle or a menace?
BBC science series Horizon is going to show us how to be immortal in 2016
6 things people often get wrong about OCD
How to choose the best diet for you...
British Documentary Awards 2014: Horizon: The Secret Life of the Cat
Alice Roberts: Boys' and girls' brains aren't so different
Six steps to happiness, fitness and weight loss