Sanders' smile is 'genuine' but Clinton is hiding something, body language expert says

Body Language Expert: Sanders' Smile Is Genuine, Clinton's Hiding Something

There has been much debate about the state of Ted Cruz's face.

The Republican presidential candidate looks like Grandpa Munster, some online pundits say. His smile doesn't reach his eyes, others have said.

READ MORE: Trump's Family Celebrates His New Hampshire Win As He Heads to South Carolina

So what's in a politician's facial expression? INSIDE EDITION spoke to a body language expert, following recent discussions including a Psychology Today post, about what cues can be derived from a candidate's smile.

See Sanders and Clinton duke it out at the last Democratic debate:

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Democratic Debate, Feb 4 2016
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Sanders' smile is 'genuine' but Clinton is hiding something, body language expert says
US Democratic presidential candidates Hillary Clinton (R) and Bernie Sanders shake hands as they participate in the MSNBC Democratic Candidates Debate at the University of New Hampshire in Durham on February 4, 2016. Clinton and Sanders face off on February 4, in the first debate since their bruising Iowa clash that the former secretary of state won by a hair, as they gear for a battle royale in New Hampshire. / AFP / Jewel Samad (Photo credit should read JEWEL SAMAD/AFP/Getty Images)
US Democratic presidential candidate Bernie Sanders participates in the MSNBC Democratic Candidates Debate at the University of New Hampshire in Durham on February 4, 2016. Clinton and Sanders face off on February 4, in the first debate since their bruising Iowa clash that the former secretary of state won by a hair, as they gear for a battle royale in New Hampshire. / AFP / Jewel Samad / ALTERNATE CROP (Photo credit should read JEWEL SAMAD/AFP/Getty Images)
US Democratic presidential candidates Hillary Clinton arrives on stage before participating in the MSNBC Democratic Candidates Debate at the University of New Hampshire in Durham on February 4, 2016. Clinton and Sanders face off on February 4, in the first debate since their bruising Iowa clash that the former secretary of state won by a hair, as they gear for a battle royale in New Hampshire. / AFP / JEWEL SAMAD / ALTERNATE CROP (Photo credit should read JEWEL SAMAD/AFP/Getty Images)
EDITORS NOTE: Graphic content / US Democratic presidential candidates Hillary Clinton (R) and Bernie Sanders chat during a break as they participate in the MSNBC Democratic Candidates Debate at the University of New Hampshire in Durham on February 4, 2016. Clinton and Sanders face off on February 4, in the first debate since their bruising Iowa clash that the former secretary of state won by a hair, as they gear for a battle royale in New Hampshire. / AFP / Jewel Samad (Photo credit should read JEWEL SAMAD/AFP/Getty Images)
EDITORS NOTE: Graphic content / US Democratic presidential candidate Bernie Sanders leaves the stage during a break as he participate in the MSNBC Democratic Candidates Debate with Hillary Clinton at the University of New Hampshire in Durham on February 4, 2016. Clinton and Sanders face off on February 4, in the first debate since their bruising Iowa clash that the former secretary of state won by a hair, as they gear for a battle royale in New Hampshire. / AFP / Jewel Samad (Photo credit should read JEWEL SAMAD/AFP/Getty Images)
EDITORS NOTE: Graphic content / US Democratic presidential candidates Hillary Clinton (R) and Bernie Sanders participate in the MSNBC Democratic Candidates Debate at the University of New Hampshire in Durham on February 4, 2016. Clinton and Sanders face off on February 4, in the first debate since their bruising Iowa clash that the former secretary of state won by a hair, as they gear for a battle royale in New Hampshire. / AFP / Jewel Samad (Photo credit should read JEWEL SAMAD/AFP/Getty Images)
EDITORS NOTE: Graphic content / US Democratic presidential candidate Hillary Clinton participates in the MSNBC Democratic Candidates Debate with Bernie Sanders at the University of New Hampshire in Durham on February 4, 2016. Clinton and Sanders face off on February 4, in the first debate since their bruising Iowa clash that the former secretary of state won by a hair, as they gear for a battle royale in New Hampshire. / AFP / Jewel Samad (Photo credit should read JEWEL SAMAD/AFP/Getty Images)
DURHAM, NH - FEBRUARY 04: Democratic presidential candidate former Secretary of State Hillary Clinton and U.S. Sen. Bernie Sanders (I-VT) shake hands at the start of their MSNBC Democratic Candidates Debate at the University of New Hampshire on February 4, 2016 in Durham, New Hampshire. This is the final debate for the Democratic candidates before the New Hampshire primaries.Ã (Photo by Joe Raedle/Getty Images)
DURHAM, NH - FEBRUARY 04: The stage is set for the start of the MSNBC Democratic Candidates Debate at the University of New Hampshire on February 4, 2016. Democratic and Republican Presidential candidates are stumping for votes throughout New Hampshire leading up to the primary on February 9. (Photo by Joe Raedle/Getty Images)
DURHAM, NH - FEBRUARY 04: Democratic presidential candidate former Secretary of State Hillary Clinton and U.S. Sen. Bernie Sanders (I-VT) stand next to each other at the start of their MSNBC Democratic Candidates Debate at the University of New Hampshire on February 4, 2016 in Durham, New Hampshire. This is the final debate for the Democratic candidates before the New Hampshire primaries.Ã (Photo by Joe Raedle/Getty Images)
DURHAM, NH - FEBRUARY 04: Democratic presidential candidate former Secretary of State Hillary Clinton and U.S. Sen. Bernie Sanders (I-VT) stand next to each other at the start of their MSNBC Democratic Candidates Debate at the University of New Hampshire on February 4, 2016 in Durham, New Hampshire. This is the final debate for the Democratic candidates before the New Hampshire primaries.Ã (Photo by Joe Raedle/Getty Images)
EDITORS NOTE: Graphic content / US Democratic presidential candidates Hillary Clinton (R) and Bernie Sanders participate in the MSNBC Democratic Candidates Debate at the University of New Hampshire in Durham on February 4, 2016. Clinton and Sanders face off on February 4, in the first debate since their bruising Iowa clash that the former secretary of state won by a hair, as they gear for a battle royale in New Hampshire. / AFP / Jewel Samad (Photo credit should read JEWEL SAMAD/AFP/Getty Images)
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Tonya Reiman tells IE that Democratic candidate Bernie Sanders "is authentic. He's always genuine ... He's got the creases, the cheeks are raised."

Hillary Clinton, not so much, Reiman says.

"She smiles just to mask whatever emotion she doesn't want you to see," Reiman said. "This is known as a social smile. There's not much movement around the eyes and the lips aren't really elevated."

Cruz, she says, seems to be sneering.

READ MORE: Sanders Wins in Tiny New Hampshire Village With 4 Votes, Hillary Clinton Gets 0

"When he smiles the initial impression is that of a sneer or a contemptuous grin. So what happens? We think of that as sarcastic and we start to dislike him."

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