A woman says she found a moth in her M&S tortilla crisps after eating a third of the bag.
Suzanne Bailey said she initially thought the object was a burnt tortilla when she served the crisps with a family meal.
The 45-year-old said she then realised it was a moth, which she believed had been cooked with the crisps.
M&S apologised, offered her a refund and said it was investigating with its supplier.
The operations manager, from Liverpool, had bought a £1.25 bag of lightly salted tortilla crisps for a Mexican meal.
She said her 13-year-old daughter Isabella had eaten one crisp and was sick after the discovery.
Ms Bailey said: "I went to pick the burnt tortilla up and this is when I realised it was a moth. My little girl had a mouthful of food and threw up.
"I was mortified as I had eaten approximately a third of the bag."
She said she found what she believed were the moth's legs when she returned the crisps to the bag as evidence, leaving her concerned she might have eaten one.
Ms Bailey added: "It's gross and absolutely disgusting. I'm not into bushtucker trials but it feels like I've done an M&S one.
"We haven't been back to shop at M&S. I don't think I could eat tortilla chips again either."
After the incident, she threw away the £10 meal and ordered a £20 takeaway to feed her family instead.
After taking photographs, she said she submitted a complaint through the M&S website and called customer support.
An M&S spokesperson said: "We take matters like this extremely seriously and are working closely with our supplier partner to investigate this fully."
The spokesperson said: "We have been in touch with the customer directly to apologise for the inconvenience caused and offer a full refund."
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