The Impact of Dietary Sweetness on Neurocognitive Responses to Visual Food Cues, Appetite and Physiological Parameters on Normal Weight Adults: a Pilot Study

University of Manchester1 个研究点分布在 1 个国家目标入组 20 人开始时间: 2018年4月26日最近更新: 2019年2月15日

适应症

干预措施

试验速览

阶段: 不适用
状态: 已完成
发起方: University of Manchester
入组人数: 20
试验地点: 1
主要终点: Appetite ratings

研究概览研究设计入排标准研究组 & 干预措施结局指标研究者研究点记录与标识符相似试验

研究概览

简要总结

This study aims to examine potential differences in neurocognitive responses to food-related cues, physiological and appetite responses as well as subsequent energy intake following the consumption of preloads differing in sweetness and/ or postprandial metabolic effects in healthy normal weight subjects.

详细描述

Excess consumption of caloric sweeteners, together with the high availability of palatable food cues are some of the factors for the alarming high rates of overweight and obesity. Although non-nutritive sweeteners (NNS) are used to decrease energy content of foods and beverages, there is an on-going debate on the relationship between NNS intake, obesity and cardiometabolic risk. Caloric sugars have a differing effect on physiological responses compared to NNS. However it is almost wholly unknown how NNS consumption affects eating behaviour and cognitive processes.

This study compares the performance on food related neurocognitive tasks following the consumption of the test preloads on 5 visits. In particular, sucrose, glucose, maltodextrin, water or a natural high potency sweetener from leaf extract will be ingested as single test agents in randomized order. Water will be used as a control for gastric distension and non-sweet, whereas maltodextrin will be used as a non-sweet control for carbohydrate content.

Participants will be asked to attend a screening visit at the Neuroscience and Psychiatry Unit of the University of Manchester on a morning after overnight fast. Participants' weight and height, fasting blood glucose and blood pressure will be measured. This will be followed by some questionnaires regarding general health status, weight and dieting history and eating behaviour.

Participants who satisfy the inclusion criteria, will be then invited to take part in the full study. This will require 5 separate visits at the University of Manchester, which will be scheduled between 11.30 and 13.30. Participants will have to attend these visits after having fasted for 3-4 hours and will be asked to have their regular breakfast in the morning before the testing session, and then not eat or drink anything else for 3-4 hours until they come in the lab for the testing session. Water will be allowed up to 1 hour prior to your testing session. Prior to each testing session participants will be asked to have the same breakfast, and they will have to provide a picture of the breakfast each time to ensure compliance.

The 5 visits correspond to 5 test beverages, both the participants and the investigators are blinded to the study treatments. Blood will be collected at 0 (before the consumption of the test beverage), 15, 30 and 60 min after the consumption of the drink. Participants will also be asked to rate their feeling of hunger, fullness etc using visual analogue scales (VAS) at the same time points 0, 15, 30 and 60 min.

研究设计

研究类型: Interventional
分配方式: Randomized
干预模型: Crossover
主要目的: Basic Science
盲法: Triple (Participant, Investigator, Outcomes Assessor)

入排标准

年龄范围: 18 Years 至 40 Years（Adult）
性别: All
接受健康志愿者: 是

入选标准

•Age 18 - 40 years
•BMI between 18.5-24.9 kg/m2
•DEBQ for restraint eating ≤ 3
•Healthy - general good health
•Currently not taking any medication (other than females taking the oral contraceptives)
•Normal or corrected vision
•Regular breakfast eaters (≥5 times per week)
•Stable weight, ≤ 5 kg last 12 months
•Fasting blood glucose ≤6.0 mmol/L
•No self-reported food allergy or intolerance to foods supplied during the study
•The participant is capable of giving written informed consent, which includes compliance with the requirements and restrictions listed in the consent form.
•The participant is able to read, comprehend and record information written in English.
•A signed and dated written informed consent is obtained from the participant.

排除标准

•Age under 18 years or over 40 years old.
•BMI ≥25 kg/m2 and <18.5kg/m2
•Subjects who are currently on a diet
•Subjects who follow special diets for weight maintenance, such as Atkins Diet, Weight Watchers, gluten-free diet, The Zone diet, Vegetarian Diet, Raw Food Diet etc.
•Subjects having breakfast fewer than 5 times per week.
•Vegetarians, vegans.
•Presence of any chronic condition requiring medication that might affect our results (e.g. diabetes, mental diseases, gastrointestinal diseases)
•Subjects with eating disorders (binge eating disorder, bulimia etc)
•Subjects who are currently experiencing anxiety or depression.
•Subjects who do not have normal vision and do not correct it with glasses or contact lenses.
•Participants who drink more than the NHS guidelines (14 units per week)
•Female participants who are, or may be, pregnant, or currently lactating.
•Subjects who regularly consume dietary supplements for weight loss, muscle building etc.
•Subjects who have aversions to foods related with the study.
•Subjects with food allergies or intolerance related with the foods/ drinks of the study.
•Habitual NNS consumers, >1 can of diet beverage or >1 table packet of sweeteners per week.
•Fasting blood glucose measured > 6 mmol/L at screening visit, according to diabetes.co.uk recommendations.
•The participant cannot read, comprehend and record information written in English.