The "feeding tube" study and the "bottomless bowl" study described in your textbook are two examples of creative ways researchers have investigated the factors the influence how much we eat

Describe these studies, the results, and what each one tells us about why we eat and why we stop.

What will be an ideal response?

Answer: A good answer will include the following key points.
? Feeding tube study
o Researchers used feeding tubes to provide volunteers with all of the nutrition their bodies needed.
o Control subjects had a feeding tube, but did not receive nutrients.
o After the feeding tubes were removed, participants reported a similar appetite and consumed just as much food under these two conditions.
o These results suggest that providing the body with all of its nutritional needs does not alleviate the
desire for the taste and textural experience of actually eating.
? Bottomless bowl
o Volunteers were asked to eat soup until they had enough.
o In the experimental condition, a tube continued to fill the soup bowl from the bottom so that it could not be detected by the volunteers.
o These individuals stopped eating after consuming, on average, over 70% more than those participants who knowingly refilled their bowls.
o Despite eating more food, these participants did not feel any more satiated, nor did they believe they had eaten any more than the individuals in the control group.
o This suggests that the perceived serving size is an important cue when determining how much we should eat.