The Facial Workout: Why It Takes More Muscles to Smile Than to Frown

PARIS, El Sky News – A widely quoted piece of anatomical trivia suggests that frowning is physically less demanding than smiling. While the exact number varies based on the type of expression, scientists confirm that a genuine, broad smile often engages a greater number of facial muscles simultaneously than a simple frown, demanding more complex muscular coordination.

Anatomy of the Expressions

The difference lies in the specific muscles recruited for each action:

• Frowning: A simple frown primarily involves muscles that pull the eyebrows down and together, such as the corrugator supercilii and the depressor supercilii. This action generally engages around 11 muscles.
• Smiling: A genuine, Duchenne smile (a smile that engages the corners of the mouth and the eyes) involves multiple muscle groups, often exceeding 20 muscles. Key muscles include:
  • Zygomaticus Major: Lifts the corners of the mouth.
  • Orbicularis Oculi: Creates the “crow’s feet” around the eyes, signaling authenticity.

Dr. Isabelle Dubois, a facial physiotherapist, notes that the complexity is what matters. “Frowning is primarily a contraction of depressor muscles. Smiling, especially a spontaneous one, requires synchronized action between both major and minor lifting muscles across the face,” she explains. “It’s not just a matter of number, but of coordination and scope.”

The Energy Myth

The underlying idea that smiling “uses more energy” than frowning is often used metaphorically to encourage positivity. While smiling uses more muscles, the energy expenditure difference between the two expressions is negligible. The energy required for either facial movement is minimal compared to larger bodily functions.

The Importance of Expression

Beyond muscle count, the facial muscles play a critical role in non-verbal communication and emotional feedback:

• Social Function: Smiling is one of the most powerful and universally recognized human signals, reinforcing social bonds and trust.
• Feedback Loop: Research suggests that the physical act of smiling can actually send feedback to the brain, positively influencing mood—a phenomenon known as the facial feedback hypothesis.

“Regardless of how many muscles you use, engaging those muscles in a positive expression offers far greater psychological returns than engaging in a negative one,” Dr. Dubois concludes.