Years ago, working in a group home for people with learning disabilities (irrelevant to this)

Charge Nurse gets an anguished phone call early morning, at home, from the female overnight staff. She was terrified that she was haemorrhaging.

Charge Nurse asked her to remember what they did yesterday.

"We harvested lots of veg from the garden, we cooked lots of beetroot and we ate lots of beetroot"

Pee went red. No issues.