Malnourished fruit flies preserve genital size to ensure reproductive success
University of Illinois ChicagoIn most animals, body size shrinks when food becomes scarce, but some parts are protected from shrinkage. In humans without enough food, the body becomes small, but the size of the head stays the same, hinting at biological mechanisms that act to preserve the all-important brain. In arthropods such as the fruit fly, whose lifespan is about 45 days and where reproductive success is the sole purpose of its life, the size of the male genitals are preserved under poor nutritional conditions.