Food for Thought (Radio 4), a series of 15-minute interviews by Nina Myskow, is such a clever idea for radio. Chat to someone – David Sedaris, Yoko Ono, Andy McNab and Judith Kerr so far this week – about their eating history, habits and quirks, and you learn a lot about them.

Today, Kerr, author of The Tiger Who Came to Tea, told Myskow about her eating life: posh teas at Claridge's as a girl; vast amounts of food disappearing when she had a teenage son; breakfast rituals with her cat when it's "in the mood". This involves rolling bits of ham and dotting them with butter. One day it didn't fancy the treat, so Kerr ate it. "It was delicious," she said with her light laugh. She also spoke of getting through a long writing day with slivers of Chunky Kit-Kat. "Those are little uppers," she said in an 88-year-old voice like filigree.

The highlight of the week, though, was Sedaris on Monday's programme. It was a fantastic listen, with several laugh-out-loud moments. He recalled the munchies in his dope-smoking days ("I would even eat the condiments"), his father's hoarding of food, which meant he ate raw carrots "like a droopy finger", and appetite-suppressant tablets. "They caused anal leakage," he said. "I found out. Later."