Effect of food deprivation and maintenance diet composition on fat preference and acceptance in rats.
High-fat diets typically elicit greater kcal intake and/or weight gain than low-fat diets. Palatability, caloric density, and the unique postingestive effects of fat have each been shown to contribute to high-fat diet hyperphagia. Because long-term intake reflects the sum of many individual eating episodes (meals), it is important to investigate factors that may modulate fat intake at a meal. The present studies used high-fat (hi-fat) and high-carbohydrate (hi-carb) liquid diets (both 2.3 kcal/mL) to assess the effect of hunger level (0 versus 24-h food deprivation) and fat content of the maintenance diet (12 versus 48%) on fat preference (when a choice among foods is offered in a two-bottle test), and acceptance (only one food offered) in male rats. Preference for hi-fat relative to hi-carb (two-bottle test) was enhanced by 24-h food deprivation, and by a high-fat maintenance diet. In contrast, neither deprivation nor maintenance diet composition influenced relative meal size (one-bottle test) of hi-fat and hi-carb: irrespective of test conditions, meal size of hi-fat was bigger than meal size of hi-carb.
Warwick
Z S
ZS
Department of Psychology, University of Maryland Baltimore County, Baltimore 21250, USA. warwick@umbc7.umbc.edu
Synowski
S J
SJ
D000818:Animals; D004040:Dietary Carbohydrates / Q000008:administration & dosage; D004041:Dietary Fats / Q000008:administration & dosage*; D004435:Eating; D002149:Energy Intake; D005508:Food Deprivation; D005518:Food Preferences / Q000523:psychology*; D008297:Male; D051381:Rats; D020318:Rats, Long-Evans; D013649:Taste
D004040:Dietary Carbohydrates; D004041:Dietary Fats