Anti-fat bias refers to the prejudicial assumption of personality characteristics based on a visual assessment of a person as suffering from obesity based on physical characteristics. Anti-fat bias can be found in many facets of society, and the media’s portrayal of obese individuals has often been blamed for the pervasiveness of this phenomenon.

Anti-fat bias leads individuals to label obese members of society with negative personality traits such as "lazy", "greedy", "stupid", "smelly", "slow", or "unmotivated." This bias is not restricted only to clinically obese individuals, but also encompasses those whose body shape is in some way found unacceptable (although still within the normal or overweight BMI range).

Anti-fat bias can be moderated by giving a mitigating context to the individual’s appearance of obesity. For example, when told an individual was obese because of "overeating" and "lack of exercise", a higher implicit bias was found among study participants than those told that the individual’s obesity was due to "genetics". The group told that "genetics" were to blame did not exhibit a lowered implicit bias after the explanation, however. Thus, anti-fat bias may result from disgust.

Troy Brandon Murphy (born May 2, 1980) is an American professional basketball power forward with the Los Angeles Lakers in the National Basketball Association (NBA). Murphy was born in Morristown, New Jersey but grew up in Sparta Township located in northwest New Jersey. He attended the Delbarton School for four years before moving on to the University of Notre Dame, where he was a two-time consensus All-American before declaring himself for the 2001 NBA Draft.

Murphy was a three-time all-county and two-time All-State performer for the Delbarton School in Morristown and coach Dan Whalen. His breakout year was as a sophomore when he averaged 20.5 points per game and 11.8 rebounds, earning first team all-county honors. He followed up his sophomore year with a successful junior campaign, averaging 23.5 points and 10.5 rebounds and All-State honors. His senior year would be his most successful season as he led Delbarton to a 20–6 record and the state quarterfinals. For the season he averaged 33.0 points per game (on 56.8 percent shooting), to lead the state in scoring along with 14.8 rebounds and 3.2 blocks per game. At the end of the season he was named Morris County Player of the Year by the Newark Star-Ledger and the most valuable player for his team at the prestigious Capital Classic in Washington, D.C..