Blue Poop Challenge


A paper was recently published in BMJ Gut about blue poo and the impact of gut transit time on the gut microbiome

In the paper the Zoe team, in collaboration with leading scientists, gave blue muffins (they're more like cupcakes!) to thousands of people and they discovered that gut transit time - the time it takes for food to travel through your GI tract - can say a lot about a person's gut microbiome.

The best part? You can take the #bluepoopchallenge too!

You can buy the blue muffins here. Or you can make the blue muffins yourself:


1 3/4 cups plain, all-purpose flour

1 Tbsp baking powder

1 cup granulated sugar

1/2 cup vegetable oil

1 cup water

1 tsp vanilla extract

1 tsp Royal blue food dye


  1. Preheat oven to 325F.
  2. Combine flour, baking powder and sugar in a large bowl and stir to mix.
  3. In a jug, combine sunflower oil, water and vanilla extract.
  4. Make a well in the center of the flour mixture and pour in wet ingredients.
  5. Add the blue food dye to...
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