New research has suggested that people who eat more slowly feel fuller and think they have eaten more than those who eat quickly.
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'People who eat slowly feel fuller faster' - Study reveals
Previous studies have found that slower eaters have lower Body Mass Index (BMI) than those who gobble down their food.
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But the reason why eating slowly is linked to being thinner has, so far, been poorly understood.
To investigate the theory, researchers from the University of Bristol, United Kingdom fed volunteers Sainsbury’s tomato soup through a tube into their mouths.
This set-up prevented the researchers from judging visually how much soup had been eaten.
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The participants then had 400ml of soup pumped into their mouths at two rates - one was at a fast rate of 11.8ml for 2 seconds, followed by a 4 second pause.
The other, the slow rate, was 5.4ml of soup for 1 second followed by a 10-second pause.
The 40 volunteers were then asked how full they felt at the end of the meal and two hours after - those who took the soup more slowly said they felt fuller than the fast eaters both immediately after the test and two hours later.
The slow eaters also overestimated how much they had eaten, guessing that on average they had eaten 108ml more soup than the other group.
The scientists believe that further research is now needed into whether eating more slowly leads to us snacking less.
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They speculate that thinking we are full may keep the weight off because it makes us less likely to start eating, but once we start we eat just as much as when we feel hungry.
Commenting on the study, Ann McDonald, a researcher at Harvard University, United States who was unconnected with the new study, said as well as our own perception of hunger, hormones in the stomach have a role to play in our feelings of fullness.
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