When it comes to food that divides opinions around the world, there isn't a better example than Marmite.
And now the salty paste has created even more controversy on social media after a recent documentary revealed how the condiment is made in factories.
As part of Channel 4's Food Unwrapped, presenter Kate Quilton went on a mission to find out exactly what goes into making the controversial foodstuff by visiting a factory in Staffordshire that specialises in Marmite and other yeasty products.
The Mirror reports the factory has been producing the spread since 1902, but viewers were taken aback at one certain ingredient that went into making it.
While at the factory, Kate spoke with Sinjin Skelton, a quality specialist who was able to shed some light on the process.
Sinjin revealed: "When breweries make beer, they take a sugary solution and they'll add yeast to it, and the yeast will convert the sugar into alcohol."
Viewers were then shown how these yeast cells produce alcohol as they multiply, meaning breweries can end up with seven times more yeast than they originally had - a lot of which isn't actually needed.
They then sell it to yeast extract factories, where it's distributed into enormous vats and heated to 95C, killing off any live yeast.
Sinjin went on to explain: "What's happening there is we adjust the temperature so the yeast starts to decay."
A centrifuge is then used to separate the "yeasty soup", leaving the broken-down cell walls as well as the contents of the cells. Many viewers had no clue whatsoever that Marmite was actually made using an alcohol by-product.
One person shuddered: "Oh gosh, I can't eat this anymore, but my childhood though".
Another commented: "Toast, marmite, and beer. Yeasty way to start the day."
Don't miss the latest news from around Scotland and beyond - sign up to our daily newsletter here .
