The results are in from a 20-year study and they show that couples that don't argue often are more likely to stay healthy and live longer than those who regularly fight.Researchers from Brigham Young University in Utah followed about 1,700-married adults over a 20-year period and measured their physical and emotional health. They found the more couples argued the worse their general health was, and that the topics most likely to spark arguments were finances and in-laws.

Researchers say this is likely because happy couples are more likely to cook and eat healthier meals together, and less stress means better sleep quality. One researcher said, "The link between happy marriages and health could be more to do with how it encourages both sides to look after each other."