Phytosterols are good for your health, but humans and other animals are not able to make them themselves. To acquire phytosterols, humans are increasingly turning to supplements, green smoothies, or a Mediterranean diet with plenty of plant-based foods. Researchers from the Max Planck Institute for Marine Microbiology in Bremen, Germany have now discovered that tiny gutless worms from the Mediterranean can synthesize phytosterols on their own. Their study, now published in Science, provides evidence that many other animals also have the genes needed to make their own phytosterols.