A full belly makes women more interested in romance, according to a new study from Drexel University and the University of Pennsylvania.

The researchers asked 20 women to fast before looking at romance-themed pictures, such as a couple holding hands. They then drank a 500-calorie shake and viewed the images again.

When the women weren’t hungry, “they were more responsive to romantic cues” and less irritated by them, study author Alice Ely told Time.