How eating with others increases consumption.
What the evidence says
- People eat more when eating with others than when eating alone — graduated effect by group size: +33% with one other, +47% with two, +58% with three, +69% with four, +70% with five, +72% with six, +96% with seven or more1
- Meals with others are larger and longer in duration1
- Effect is strongest with family and friends (familiarity → relaxation → disinhibition)1
- Women show significantly larger modeling effects than men (r = .39 vs. r = .17, p = .03), consistent with greater concern about how they are viewed while eating2
- Social interaction extends meal duration, which increases intake1
- Effect occurs regardless of time of day1
- Body weight of eating companion moderates social matching: matching less likely when normal-weight participant ate with underweight or overweight confederate3
- Descriptive norm messages ("most people choose the healthy option") can shift food choices, but effectiveness depends on perceived in-group identity with the norm source3