does texture affect appetite? a study of sensory specific satiety in college-aged males project...
TRANSCRIPT
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Does Texture Affect Appetite? A Study of
Sensory Specific Satiety in College-Aged Males
Project Leader: Amelia Keaton
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Humans Exhibit Sensory Specific Satiety
• Novel sensory properties of foods induce satiated subjects to eat more in a multi-course meal (Rolls,B.J. 1980)
• Model of overeating and weight gain
• Is this a possible method of increasing food consumption in astronauts who experience a loss of appetite?
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Sensory Properties That Affect Food Intake in Humans
• Portion Size (Rolls, B.J., 2002)
• Palatability (Rolls, B.J. et al, 1982; Rolls, E.T., 1996)
– Taste– Odor– Appearance– Texture?
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Why is this important?
•If we can manipulate the texture of a limited number of food items, then we can possibly increase food intake in astronauts.
•This would prove especially important for long-term space missions and lunar or planetary colonization.
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Hypothesis
• Hungry subjects fed to satiety on foods of one texture will eat more of the same foods when presented as a different texture.
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Methods: Meals
• Water (~275 mL)
• Unsalted Crackers (4 kcal/g)
• Crushed or Chunked:– Pineapple (0.6 kcal/g)– Cheese (3.9 kcal/g)– Peanuts (5.8 kcal/g)
Chunked
Crushed
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Experimental TimelineSubject Arrives(males age 17-22) •Fasted ~12 hrs•Signs Waiver•Reads instructions
T=15mins
•Meal 1 ends•5min break•Assignedto crush or chunk groupfor Meal 2
Meal 2: T=20mins
•Meal 2 presented (crush or chunk)
•VAS completed
T= 35mins
•Meal 2 ends
•Subject Released
Instructions: 1) Do not mix food. 2) Drink all water within 15 minute meal.
3) Eat until you’ve had enough during each meal. 4) Do not communicate with other subjects about the food.
Meal 1: T=0mins
•Crushed MealPresented
•VAS Completed
Data Collection and Analysis
•Consumption was measured by mass and calories after each meal•One-way ANOVA and post hoc Student Newman Keuls testing•t-tests where appropriate
or
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Subjects
Crush/crush
n= 19
Crush/chunk
n= 17
p-value
(t-test)
Height (cm) 180.0 ±1.9 181.2 ± 1.7 0.637
Weight (kg) 80.0 ± 3.3 82.1 ± 3.7 0.676
Age (yr) 19.0 ± 0.3 19.8 ± 0.3 0.075
Body Mass Index
(range)
24.3 ± 0.8
20-32
24.9 ± 0.8
20-32
0.567
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Meal 1 Food Intake (mass)
Total Intake Peanut Pineapple Cheese Crackers
Me
al 1
fo
od
in
tak
e (
g)
0
100
200
300
400
crush/crush (n=19)crush/chunk (n=17)
*p=0.007
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Meal 1 Food Intake (calories)
Total Intake Peanut Pineapple Cheese Crackers
Me
al 1
fo
od
in
tak
e (
ca
lori
es
)
0
100
200
300
400
500
600
700
800
900
1000
Crush/crush (n=19)Crush/chunk (n=17)
*p=0.005
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or
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*~40%
*~60%
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Meal 2 Food Intake (mass)
Total Intake Peanut Pineapple Cheese Crackers
Me
al 2
fo
od
in
tak
e (
g)
0
50
100
150
200
250
300
350
crush/crush (n=19)crush/chunk (n=17)
* p<0.001
* p<0.003
p=0.067
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Meal 2 Food Intake (calories)
Total Intake Peanut Pineapple Cheese Crackers
Me
al 2
fo
od
in
tak
e (
ca
lori
es
)
0
100
200
300
400
500
600
700
800
900
1000
Crush/crush (n=19)Crush/chunk (n=17)
*p<0.001
*p=0.0012X
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Summary• Subjects offered a different texture in Meal
2 consumed significantly more mass and calories than those offered the same texture.
• Subjects offered a different texture in Meal 2 rated that meal as more appealing than those offered a second meal of the same texture.
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• Humans demonstrate Texture-Specific Satiety.
• Changes in texture of some foods are sufficient to increase the amount of food consumed in a multi-course meal.
• Since taste and smell are attenuated in space, manipulations of texture may be especially effective in promoting food intake.
Conclusions and Applications
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Future Directions for Human Studies
• In order to increase food intake, it may be possible to manipulate the following food properties while subjects are in a head-down tilt model of microgravity:– Palatability– Energy density– Texture
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Acknowledgements
• We would like to thank the Bio250 and Bio 450 research classes at Wofford College for collecting the preliminary data for experiments presented today