The reason why wasps often bite in autumn.

Why does bumblebee love to sting some people? The same ingredient in cosmetics and fast food may confuse bumblebees and make them sting more easily.

According to a Japanese study published in the journal Nature, a chemical in the venom gland of bumblebees is similar to an additive used in food and spices, which may stimulate bumblebees to attack humans.

Nearly 74 people in Japan die from insect bites every year, most of them are bumblebees.

Now scientists in Tokyo think they can explain why these insects suddenly attack humans without obvious provocation.

An ingredient in cosmetics, spices and food seems to inspire bumblebees to enter what scientists call an "angry defense state."

In these foods, a chemical substance or pheromone can be found, which is similar to the pheromone released by insects when they are threatened.

They found that this warning pheromone exists in the venom gland of the largest wasp in the world.

Further research shows that this substance also exists in all seven species of bumblebees in Japan; Scientists now wonder whether cosmetics and processed foods should be screened to determine whether there are pheromones that become warning signals of dangerous insect attacks.