1. Impact of physical activity level and dietary fat content on passive overconsumption of energy in non-obese adults.
- Author
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Beaulieu, Kristine, Hopkins, Mark, Blundell, John, and Finlayson, Graham
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BLOOD sugar analysis , *BODY composition , *ANALYSIS of variance , *APPETITE , *BASAL metabolism , *CALORIMETRY , *CARDIOPULMONARY system , *CROSSOVER trials , *ENERGY metabolism , *EXERCISE tests , *CARBOHYDRATE content of food , *FAT content of food , *FOOD habits , *FOOD preferences , *HUNGER , *INGESTION , *INSULIN , *MATHEMATICS , *RESEARCH methodology , *PEPTIDES , *PLETHYSMOGRAPHY , *PROBABILITY theory , *PSYCHOLOGICAL tests , *QUESTIONNAIRES , *REWARD (Psychology) , *STATISTICAL sampling , *SATISFACTION , *STATISTICAL hypothesis testing , *T-test (Statistics) , *WEARABLE technology , *LEPTIN , *STATISTICAL power analysis , *GHRELIN , *EFFECT sizes (Statistics) , *TREADMILLS , *BODY mass index , *VISUAL analog scale , *ACCELEROMETRY , *OXYGEN consumption , *PHYSICAL activity , *DATA analysis software , *WAIST circumference , *DESCRIPTIVE statistics ,RESEARCH evaluation - Abstract
Background: Passive overconsumption is the increase in energy intake driven by the high-fat energy-dense food environment. This can be explained in part because dietary fat has a weaker effect on satiation (i.e. process that terminates feeding). Habitually active individuals show improved satiety (i.e. process involved in post-meal suppression of hunger) but any improvement in satiation is unknown. Here we examined whether habitual physical activity mitigates passive overconsumption through enhanced satiation in response to a high-fat meal. Methods: Twenty-one non-obese individuals with high levels of physical activity (HiPA) and 19 individuals with low levels of physical activity (LoPA) matched for body mass index (mean = 22.8 kg/m²) were recruited. Passive overconsumption was assessed by comparing ad libitum energy intake from covertly manipulated high-fat (HFAT; 50% fat) or high-carbohydrate (HCHO; 70% carbohydrate) meals in a randomized crossover design. Habitual physical activity was assessed using SenseWear accelerometers (SWA). Body composition, resting metabolic rate, eating behaviour traits, fasting appetite-related peptides and hedonic food reward were also measured. Results: In the whole sample, passive overconsumption was observed with greater energy intake at HFAT compared to HCHO (p < 0.01), without any differences between activity groups (p > 0.05). SWA confirmed that HiPA were more active than LoPA (p < 0.01). HiPA had lower body fat and greater fat-free mass than LoPA (p < 0.05 for both) but did not differ in resting metabolic rate, eating behaviour traits, appetite-related peptides or food reward (p > 0.05 for all). Conclusions: Non-obese individuals with high or low physical activity levels but matched for BMI showed similar susceptibility to passive overconsumption when consuming an ad libitum high-fat compared to a high-carbohydrate meal. This occurred despite increased total daily energy expenditure and improved body composition in HiPA. Greater differences in body composition and/or physical activity levels may be required to impact on satiation. [ABSTRACT FROM AUTHOR]
- Published
- 2017
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