Obesity is a major global health challenge and the prevalence of obesity is increasing. Presence of obesity increases the risk of several diseases, physical limitations and an increased mortality. When weightloss is wanted in order to avoid or treat some of these diseases, medical weight loss treatment is one of the options. Among these modified gut hormones, such as Glucagon Like Peptide -1 Receptor agonists (GLP-1RA). However, the individual response to GLP-1RA treatments varies considerably. Currently the best predictor of total weight loss is achieved weight loss after three months of treatment. With more pharmaceutical options to come, a trial and error approach is not appropriate. There is a need to identify possible pre-treatment predictors to treatment response.
This is one of the project\'s main aims. By being able to predict the treatment response, one can tailor the obesity treatment to the individual improving the treatment outcome.
Amylin is co-secreted with insulin from the pancreas in response to meals. It is found to have many similar effects in the body as GLP-1. However their combination, especially on appetite, food preferences and eating pattern is sparsely investigated. This is the other main aim of the project.
This clinical study will be a 26 week, randomized, double-blinded, placebo-controlled trial. Forty overweight (BMI ≥30kg/m2) individuals with pre-diabetes (HbA1c 39-47 mmol/mol) will all receive once-weekly semaglutide for 26 weeks. Semaglutide will be given in escalating doses aiming to reach the maximal dose of 2.4 mg (maximum dosage approved for treatment of overweight), but accepting lower maximal tolerable dosage.
After 24 weeks of treatment, they will be stratified according to their weight loss (\<15% or ≧15%) and based on this stratification, block randomized 1:1 to receive either pramlintide or placebo(normal isotonic 0.9% saline solution) in addition to weekly semaglutide. Pramlintide will be continuously infused, starting at a dosage of 7,5 mcg/hour for three days, and if tolerated, the dosage will be increased to 15 mcg/hour for the remaining eleven days. Previous studies have found measurable changes in appetite after a single dosage of pramlintide, and measurable weight loss after two weeks of treatment. For the continuous infusion a commercially available insulin pump will be used.
At study start and, prior to semaglutide treatment, body composition, REE and gastric emptying rate will be measured. Various aspects of appetite will be assessed by the results from the meal tests, the "taste test", appetite assessment and eating related questionnaires. An appetite Visual Analog Scale (VAS) will be measured prior to, and following the standardized meal test and the ad libitum meal test. Satiety will be assessed by a VAS following the standardized meal test. Appetite related sensory specific desire will be assessed by the participants rating of a "taste test" consisting of a variety of small food samples representing the sensory profiles of sweet, sour, salt, bitter, fat, umami/savory and spicy, respectively. The "taste test" will be performed prior to the ad libitum test and as previously described. And satiation will be assessed by measuring calories consumed to reach fullness and terminate the meal at the ad libitum meal test. While the Food pleasure scale, Yale Food Addiction Scale 2.0, Dutch Eating Behavior Questionnaire and The Eating Disorder Quality of Life Scale questionnaires will assess hedonic, emotional and binge- eating patterns and eating related quality of life. The combined results of these physical measurements, questionnaires, appetite and hunger assessments will be used to identify the participants\' main obesity driver or obesity "phenotype" similarly as previously described.
These tests will be repeated at the end of the study and the results compared. The "taste test" and ad libitum meal test will also be performed after 24 weeks, prior to the addition of either pramlintide or placebo.
Additionally blood samples will be taken at baseline, after 24 weeks and at the end of the study, measuring biomarkers related to metabolism, bone metabolism and organ specific biomarkers.
