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Query: UMLS:C0020175 (hunger)
 5,670 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

Female albino rats trained to press a bar to turn off a bright light while water-satiated performed better than rats trained while thirsty. It is suggested that thirst elicits responses such as increased activity which compete with stationary behavior required for bar-pressing. Since the proposed competing responses may facilitate locomotor behavior, this hypothesis might also explain the general finding that hunger or thirst facilitates performance on tasks where escape or avoidance requires locomotion. Switching satiated subjects to the thirsty condition caused decreased performance, while the opposite shift apparently failed to improve performance above the level of a control group.
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PMID:Effect of thirst and change of thirst on bar-pressing to escape bright light. 75 71

Three experiments analysed the effect of re-exposure to the reinforcer following aversion conditioning on instrumental performance. In the first experiment, groups of hungry and thirsty rats were trained to press a lever for sucrose, which was then followed by a single injection of lithium chloride (LiCl). On the following day, half the animals in each motivational condition received re-exposure to the sucrose solution; the remaining animals were not re-exposed. In a subsequent extinction test animals that had received re-exposure to the sucrose pressed less than animals that were not re-exposed. Moreover, the effect of re-exposure to the sucrose solution was similar following training under hunger and thirst. In the remaining studies, animals were trained to lever-press for sucrose while either hungry or thirsty. They were then injected with LiCl and re-exposed to the sucrose while either hungry or thirsty, i.e. in the same or different motivational state employed during training, or they were not re-exposed. Lever pressing was then tested in extinction in the training motivational state. As in the first experiment, re-exposure to the reinforcer after aversion conditioning enhanced the magnitude of the reinforcer devaluation effect. More importantly, re-exposure to the sucrose produced a comparable effect on instrumental performance, whether re-exposure was given under the same or different motivational state to that employed during training. These results suggest that the instrumental reinforcer devaluation effect depends upon a process of incentive learning, but that this process is not conditional upon the current motivational state of the animal.
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PMID:Incentive learning following reinforcer devaluation is not conditional upon the motivational state during re-exposure. 147

Thirsty rats were trained to press a lever for either a sucrose solution or saline before performance was tested in extinction while the animals were either hungry alone or experiencing both hunger and a sodium appetite. Reinforcer-specific motivational control was observed in that the animals trained with the sucrose solution pressed more than those trained with the saline when they were tested hungry, but not when they were tested under combined hunger and sodium appetite. In order to assess the role of a Pavlovian incentive process in this effect, thirsty animals received non-contingent pairings of one stimulus with the sucrose solution and another with saline in the second experiment. In an extinction test the sucrose stimulus augmented lever pressing relative to the saline stimulus when the animals were hungry, but not when they were thirsty. In the subsequent experiments the contribution of the Pavlovian process was equated by giving concurrent training with both incentives. Lever pressing and chain pulling were reinforced concurrently, one with the sucrose solution and the other with saline, while the animals were thirsty. Once again, the animals pressed more in extinction if this action had been trained with the sucrose solution rather than the saline, but only if they were hungry rather than thirsty. Thus, instrumental performance across a thirst-to-hunger shift can also be controlled by an instrumental incentive process. The direct engagement of the instrumental process by this motivational shift contrasts to the absence of such control following a hunger-to-thirst transition (Dickinson & Dawson, 1987a), a fact attributed to the asymmetrical motivational interactions produced by water and food deprivation.
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PMID:Motivational control of instrumental performance following a shift from thirst to hunger. 228 40

Eleven healthy male subjects of normal body weight received either 60 mg of the 5-HT re-uptake inhibitor fluoxetine (FXT) or matching placebo daily for two weeks, with a minimum one month wash-out period between treatments. Subjects attended on days 1, 8 and 15 from 08.50 h to 15.15 h in each treatment period when food and fluid intake, body weight, pulse and blood pressure, pupil diameter and plasma levels of FXT and NorFXT were measured and visual analogue scales (VAS) for subjective ratings of hunger, satiety, thirst, mood, arousal, nausea and gastric discomfort were completed. The trial was of a double-blind randomised crossover design, each subject acting as his own control. FXT reduced food intake by 15.7 per cent on day 1; by 12.6 per cent on day 8 but not on day 15. Hunger ratings were lowered by FXT on days 8 and 15 but not on day 1. Subjects were less thirsty when taking FXT but there was no concomitant reduction in fluid intake. FXT produced some mydriasis and slowed heart rate. In two weeks treatment with FXT there was a statistically significant weight loss of 1.07 kg compared to a mean weight gain of 0.15 kg on placebo. The incidence of reported side effects was low, drowsiness and stomach discomfort were reported by some subjects on days 8 and 15.
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PMID:The effect of the 5-HT re-uptake inhibitor fluoxetine on food intake and body weight in healthy male subjects. 236 13

The characteristics of fluid intake in humans were investigated using a diary self-report method. Thirty-six adult humans were paid to record in a diary, for 7 consecutive days, everything that they either ate or drank, the time that they ingested it, and how thirsty and hungry they were on seven point scales. The diary entries were encoded and entered into a computer. Draughts were identified according to five different bout definitions and three different definitions of fluid amount; total fluid ingested in both solids and liquids, excess fluid ingested above digestive requirements, and total fluid ingested in "drinks." The fluid and caloric compositions of the bouts, the estimated stomach contents at the beginning and end of the bouts, and prebout and postbout intervals were calculated. These variables were then interrcorrelated with univariate and multivariate techniques. Self-rated thirst and hunger were found to be equivalent in magnitude at the beginning of the draughts but self-rated hunger was more closely associated with the prebout interval and stomach contents of food and water than was self-rated thirst. Subjective thirst was found to be negatively related to the amount in the stomach regardless of composition. The amount of fluid ingested, regardless of its definition, was found to be primarily related to the amount of food ingested in the bout, not to the estimated prebout stomach contents or the prebout interval, and only slightly with self-rated thirst. "Drinks" which occurred independent of eating were relatively rare but were strongly correlated with the degree of subjective thirst. The amount of time that would elapse before the subsequent draught, the postbout interval, was related to the amount of food ingested in the bout and not to the amount of liquid ingested regardless of definition. It was concluded that the spontaneous intake of fluid by humans, under ad lib conditions, occurs in excess of requirements, is principly determined in amount and timing by eating, and water balance is left to regulation by the kidneys.
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PMID:A microregulatory analysis of spontaneous fluid intake by humans: evidence that the amount of liquid ingested and its timing is mainly governed by feeding. 323 84

Perception of hunger and satiety was examined by means of event-related potential (ERP) recordings. On the basis of Helson's frame-of-reference theory, it was hypothesized that hunger is perceived with reference to an actual adaptation level. ERPs were recorded to adjectives (hungry, thirsty, tired) combined with one of five adverbs (very, almost, somewhat, hardly, not). Subjects indicated whether a particular adverb-adjective combination accurately described their actual feeling of hunger, thirst, or fatigue. They were tested after they had fasted for 16 hr and another time when they were satiated. Area of P300 of the ERP was smallest for adverb-adjective combinations agreeing with the subject's actual state of hunger (i.e., adaptation level), which was almost hungry in fasting subjects and hardly hungry in satiated subjects. These P300 minima were flanked by significantly enhanced (p < 0.001) P300 areas for the immediately adjacent adverbs combined with hungry. P300 areas for adverbs combined with thirsty and tired did not depend on the subject's state of hunger. The data suggest that perception of internal states, such as hunger, refers to an adaptation level that is sensitively indicated by P300 area.
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PMID:Event-related brain potential correlates of self-reported hunger and satiety. 841 58

In early palliative stages effective nutrition can improve well-being. In late stages and in dying patients excessive amounts of proteins and lipids may induce nausea and vomiting, due to cachexia and subsequent changes in the metabolism. Excessive hydration may give rise to oedema and dyspnoea. In these late stages the patient rarely feels hungry or thirsty. The goal should therefore be to do good, not to harm and to respect the autonomy of the patient. Thus, the well-being of the patient should be in focus: to avoid hunger, thirst, nausea, vomiting, oedemas and dyspnoea. The consequences are that small amounts of carbohydrates and water often constitute the optimum for these patients.
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PMID:[Quality of life is the most important goal of nutritional support of the dying]. 1075 Mar 87

In order to investigate the changes produced by Type I diabetes on the ad libitum eating behavior of free-living humans, 56 French participants with diabetes and 28 healthy controls were paid to maintain detailed food intake diaries for four 7-day periods. The participants with diabetes ate more protein and more frequent meals, ate slightly later and with fewer other people, were less hungry, thirsty, and depressed, but more elated than the healthy participants. Responses to social facilitation, the diurnal rhythm, subjective hunger, the palatability of the food, and the weekend were not affected by the presence of diabetes. The participants with diabetes had significantly larger correlations and regression coefficients for the relationship between meal size and the duration of the before-meal interval. The relationship between meal size and the after-meal interval was strong and positive in all participants. The recorded behavioral characteristics of diabetics may, in part, be accounted for by the nutritional education that is provided as an integral part of treatment. Based upon these results, it was theorized that the glucose regulatory system is an influence on intake, but only one of many that are responsible for the coordination, control, and regulation of nutrient intake in free-living humans.
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PMID:The effect of Type I diabetes on the eating patterns of free-living French: a diet diary study. 1206 23

This study investigated the effects of food deprivation on the body image in female restrained and unrestrained eaters. Twenty female restrained eaters and 20 female unrestrained eaters were asked to identify their current and their ideal body shape by choosing them from a sample of nine female silhouettes. This test was conducted under three deprivational conditions: hungry, thirsty and non-deprived (neither hungry nor thirsty). The discrepancy between the current and the ideal body shape-termed as body dissatisfaction-did not differ significantly between restrained and unrestrained eaters when thirsty or satiated. Under hunger, however, the restrained eaters scored a significantly larger discrepancy between their current and ideal body shape than the unrestrained eaters. The data suggest that women with restrained eating behavior feel a body dissatisfaction when being hungry.
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PMID:Body dissatisfaction in female restrained eaters depends on food deprivation. 1611 85

Meal replacement products for weight loss are popular and safe for most unsupervised consumers desiring to lose weight. Previously we reported that the thickness of meal replacement diet shakes had a direct and significant effect on hunger intensity during the first 2 h and that hunger intensity scores for liquid meal replacements were significantly below baseline for 3 h following consumption (Mattes & Rothacker, 2001) This study uses the same protocol to investigate meal replacement bars designed for overweight consumers. Subjects were prescreened to include only those that normally ate breakfast and liked chocolate. The bar used in this study contained 250 calories (about 30 more than most liquid diet shakes), 4 g dietary fiber, 14 g protein and 8 g fat. Subjects were instructed to consume the entire bar with a glass of water following an overnight fast when they would normally consume their first meal of the day and to assess their hunger on a 1 (not hungry at all) to 9 (as hungry as I have ever felt) scale before consumption, immediately after and hourly for 6 h (only on typical weekdays). Similar assessments were made for the perception of stomach fullness (1=empty, 9=extremely full), strength of the desire to eat (1=no desire, 9=extremely strong) and thirst (1=not at all thirsty, 9=extremely thirsty). One-hundred and eight subjects (23 male and 85 female) completed the study. No gender satiety differences were found. Hunger ratings and desire to eat remained significantly below baseline for 5 h following consumption. Stomach fullness scores were significantly above baseline for 5 h. Thirst scores were significantly below baseline for 3 h. In conclusion, although the meal replacement diet bars contained only 30 additional calories than liquids, they provided an additional 2 h of hunger suppression from baseline that may have an impact on overall weightloss success. These results support superior short-term hunger control with solid meal replacements.
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PMID:Short-term hunger intensity changes following ingestion of a meal replacement bar for weight control. 1522 99


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