Fish oil studies reveal a rift in the science around the pros and cons of omega-3 fatty acids, raising questions about how much a person should take—if any.

A recent study published in BMJ Medicine suggests that ingesting these oily little pills may contribute to atrial fibrillation and stroke.

However, an analysis of the collective research suggests that the seeming contradiction in the science is more likely reflecting the fact that people are different and what may harm some may help others.