Canadian boffins have revealed that red meat is a natural tranquiliser.

Apparently the sight of steak reminds our inner cavemen of happy days round the ancestral fire.

"Ancestors would be calm as they would be surrounded by friends and family at meal time," said researcher Frank Kachanoff of McGill University.

Conventional wisdom held that red meat makes you aggressive. But the latest news may explain why some veggies get so angry if you sneak a little beef into their carrot compote.