The Effects of a Single Day of Mixed Macronutrient Overfeeding on Energy Balance and Metabolic Responses in Healthy Young Men

All testing will take place within the Carnegie Research Institute, Leeds Beckett University. We will ask all the participants to visit on five occasions for the completion of a preliminary screening trial and two single-blind counterbalanced experimental trials which each require the participants to visit the laboratory on two consecutive days. The experimental trials will be separated by a minimum of one week.

Visit 1: Preliminary Screening:

Before an individual can take part in the experiment, they will need to undergo screening. Individuals will need to complete a Health Screen Questionnaire. Individuals will be excluded from the study if they are not currently in good health, have any condition that would alter their metabolism and/or have had significant medical problems in the past that may affect the outcomes of the study. Individuals will also be asked to be complete a Three-Factor Eating Questionnaire, to check that they are not restrained eaters, and an International Physical Activity Questionnaire (IPAQ) to ensure that all participants are either sedentary or moderately active. All individuals will be asked to confirm that they have been weight stable for at least six months before participating and that they are not currently dieting. Height, body mass and age will be collected to calculate the energy requirements for the main trials based on the Mifflin equation.

Visits 2, 3, 4 and 5: Experimental Trials:

The participants will be asked to record their food intakes and activity patterns during the three days prior to the first experimental test using a food and physical activity diary. They will then be instructed to repeat this diet and activity pattern prior to the second experimental trial. Participants will be required to arrive at the laboratory for all experimental trials after an overnight fast of at least 10 hours and having refrained from any strenuous activity for 48 hours, and alcohol and caffeine consumption in the previous 24 hours. Two hours before arriving at the laboratory on the day of the experimental trials, participants will be required to ingest 300 mL of water to standardise hydration levels for the trial.