Chemosensory function and food perception is affected in COPD, but unrelated to sarcopenia risk.

BACKGROUND & AIMS: Patients with advanced COPD often have difficulty maintaining sufficient dietary intake. Chemosensory function influences food choice and intake but is often overlooked in dietary assessment and intervention strategies. This study aimed to assess differences in chemosensory function and hedonic evaluation of food between patients with COPD and age- and gender-matched healthy controls. Additionally, a possible association between increased risk of sarcopenia or frailty and chemosensory impairments was explored. METHODS: We recruited 53 COPD patients (34 males, mean age 66.6 ± 7.6 years) and 53 controls (25 males, mean age 68.4 ± 5.7 years). Chemosensory function was assessed using a smell threshold, smell identification (Sniffin' Sticks, Burghart) and taste recognition test (Taste Strips, Burghart) and through self-report. Sensory properties (appearance, smell, taste, mouthfeel) of four standardized food products were evaluated on 9-point hedonic rating scales. Sarcopenia risk was assessed with the SARC-F. RESULTS: The COPD group scored lower on both the smell (p = 0.026 for threshold, p = 0.001 for identification) and taste recognition tests (p < 0.001) and also reported more smell and taste impairments (p < 0.001) compared to controls. Hedonic evaluation of food items' appearance (p = 0.009) and smell (p = 0.033) was lower in COPD patients. Within the COPD group, risk of sarcopenia was not associated with chemosensory function. CONCLUSION: This study demonstrates that COPD patients have poorer chemosensory function and experience more impairments compared to controls. COPD patients also tend to evaluate foods less positive than do their controls but within COPD patients, sarcopenia risk is not associated with chemosensory function.

The interactive effect of hunger and impulsivity on food intake and purchase in a virtual supermarket.

OBJECTIVE: It has been shown repeatedly that impulsivity, obesity and food intake are related; obese people are more impulsive than lean people and impulsive people eat more than less impulsive people. The relation between impulsivity and food intake might be state dependent; hunger motivates food seeking behaviour and food consumption, especially of high caloric food. Difficulties to overrule automatic behavioural tendencies might make impulsive people more susceptible to the effects of hunger on food selection. Therefore, they are expected to increase their intake more than low impulsive people when feeling hungry. STUDY 1: Fifty-seven female participants were randomly assigned to a hunger or sated condition. Response inhibition (a measure of impulsivity) and food intake were measured. Results show that impulsive participants ate significantly more, but only when feeling hungry. STUDY 2: Ninety-four undergraduate students participated. Hunger, response inhibition and the purchase of food in a virtual supermarket were measured. The same interaction was found: impulsive participants bought most calories, especially from snack food, but only when feeling hungry. CONCLUSION: Hunger and impulsivity interact in their influence on consumption. These data suggest that reducing hunger during calorie restricting diets is important for successful weight loss, particularly for the impulsive dieters.

Factors affecting context specificity of appetitive conditioned responding.

The present experiment contributes to the identification of factors affecting magnitude of context specificity of simple appetitive conditioned responding. Rats were first trained to associate an auditory and a visual stimulus with food. Each of these stimuli was consistently presented in a distinctive environmental context. Groups of rats differed only in the number of conditioning trials. At test, all groups received trials on which each of the stimuli was presented either in the same context as used during training, or in the different context. Rats made significantly fewer food-magazine visits on different-context trials than on same-context trials only under the conditions that the stimulus tested was the auditory stimulus, which generally elicited a stronger conditioned response (CR) than did the visual stimulus, and the animals had received a relatively small number of conditioning trials. Apparently, magnitude of context specificity is affected by factors determining the strength of the appetitive conditioned response to the target stimulus.