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"I was so hungry, I took five chapatis and ate them with tea," Caleb says.

Memories of the chapati study came "flooding back", the daughter says, after recent media coverage.

An MP said she would call for a debate regarding the use of "radioactive isotopes in chapatis" once fed to South Asian women to study iron absorption.

A restaurant on the outskirts of Nairobi skimps on the size of its chapatis - a flaky, chewy Kenyan flatbread - to save on cooking oil.

“We had to reduce the size of our chapatis because even after we increased the price, we were suffering because cooking oil prices have also remained high,” Kioko says.