A new book about bizarre World War II plots revealed the strangest one of all: British spies planned to lace Adolf Hitler's food with female sex hormones to curb his aggressive tendencies.

Agents planned to dose Hitler's food with estrogen to make him less aggressive and more like his sister, Paula who was a secretary at the time.

According to Professor Brian Ford, author of the book "Secret Weapons: Technology, Science and the Race To Win World War II" allies decided on estrogen because unlike other poisons it was tasteless and would have a slow and subtle effect to pass undetected by Hitler's food testers.

"Hitler had testers who used to taste his meals so there was no mileage to putting poison in his food because they would immediately fall victim to it," Professor Ford said.

"Sex hormones were a different matter. They only affected you if you took them for weeks or months on end, so no one would have ever realized that the hormones were in the food."

With the war in a stalemate Allies were desperate and desperation apparently meant even more wacky plots. Other plots included dropping glue on Nazi troops to stick them to the ground and disguising bombs as tins of fruit being exported to Germany.

Professor Ford, a fellow at Cardiff University and a pioneer of popular science said the British Government gave serious consideration to the sex hormone plan and that it was perfectly plausible. British spies were already in place and poised to carry out the plot.

The Allied plots have only been uncovered recently because of their sensitive nature.

The Allies were not the only ones who were cooking up hare-brained schemes to win the war.

The Nazis had plans to poison sausages, chocolate and Nescafe if they lost the war, leaving them where they would be found by Allied troops.