减重≠减脂，使用司美格鲁肽并不是要你一味的节食

Core Viewpoint - Weight loss is not equivalent to fat loss; the ideal scenario is to reduce fat while preserving muscle mass, as muscle helps maintain basal metabolic rate and body shape [2][4]. Group 1: Weight Loss Mechanism - Over-restrictive dieting can lead to muscle loss primarily due to nutritional deficiencies, as the body prioritizes muscle tissue for energy when caloric intake is significantly low [4]. - Hormonal changes, such as increased cortisol and decreased testosterone levels, can further promote muscle breakdown and inhibit muscle synthesis [4]. - Long-term low-calorie intake may reduce metabolic rate, making it harder to maintain muscle mass [4]. Group 2: GLP-1 Medications - GLP-1 receptor agonists (GLP-1 RAs) mimic the action of the natural hormone GLP-1, which plays a crucial role in blood sugar regulation [5]. - These medications promote insulin secretion in a glucose-dependent manner, helping to lower postprandial blood sugar levels [7]. - GLP-1 RAs inhibit glucagon secretion, which typically raises blood sugar levels when they are low, thus aiding in blood sugar control [7]. - They also delay gastric emptying, reducing the speed at which food enters the small intestine, which helps manage post-meal blood sugar spikes [8]. - Additionally, GLP-1 RAs act on the brain's appetite regulation centers to suppress appetite, aiding in weight management [9]. - Long-term use of GLP-1 RAs may improve or protect pancreatic beta-cell function, which is particularly important for type 2 diabetes patients [10]. Group 3: Weight Loss Results - In the PIONEER PLUS phase 3 study, participants treated with oral semaglutide for 68 weeks lost an average of 9.2 kg (9.54%) and 7.0 kg (7.26%) at doses of 50 mg and 25 mg, respectively [11]. - The latest OASIS 1 study reported that participants in the 50 mg group lost an average of 18.34 kg (17.4%), indicating an improvement in weight loss efficacy [12].