Ghrelin is a stomach hormone with two very unpopular qualities: hunger enhancement and fat storage. When your stomach is empty, this hormone is secreted to help persuade you to find food. A study published in the Journal of Neuroscience suggests ghrelin might also fine-tune your sense of smell to not only locate food but decide what’s best among potential choices.

True Strength Moment: Smell is an important part of eating, even if you’re just drinking a protein shake. Next time you’re getting ready to mix one up, take a sniff inside the tub of powder. If the aroma makes you want to enjoy the end result that much more, you should know that a lot of hard work goes into making ON shakes mix up easily every time and taste exactly as expected. We think you and your nose are worth the effort.