It could also relate to excessive fat intake, food intolerances, or a gut infection or parasite.
It could mean that you’ve been eating lots of yellow foods, such as turmeric or yellow food colouring or are taking certain medications (particularly those for gastroesophageal reflux disease GERD).
Bright red poo
This could mean you’ve eaten beetroot recently, but if not it suggests ‘new’ blood in the stool, which could result from haemorrhoids or bleeding in the lower part of the large intestine.
Dark red poo
Again, this can suggest bleeding in the rectum or lower gut and should be checked, although it can also result from eating red foods or food dyes.
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