In the 1940s, some vulnerable Swedish hospital patients were fed large amounts of sugary sweets as part of an experiment to see what it would do to their teeth.

Researchers considered the study a success as it led to new recommendations for children to eat sweets just once a week.

In the 1990s, the unethical aspects of the experiment emerged when Elin Bommenel became the first researcher to gain access to the original documents from the experiments. Sweden's government has never formally apologised for what happened, although it has greatly improved care for vulnerable children and adults.

Elin tells Frida Anund about the revelations.

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(Photo: A sugar cube. Credit: Getty Images)