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GLP 1 acts in several ways: In the brain , it helps reduce hunger signals and quiets food noise , the constant mental chatter around eating In the gut , it slows gastric emptying, which prolongs the feeling of fullness This slower digestion contributes to weight loss, but it can also lead to constipation by increasing intestinal transit time Constipation is one of the most common side effects of GLP 1 medications

Quick Answer: GLP-1 injections begin suppressing appetite within one to two weeks, with measurable weight loss starting by week four and hemoglobin A1c reductions evident after 12 to 16 weeks

Use sterile handling

Weight loss injections such as semaglutide (Wegovy) and tirzepatide (Zepbound) can produce significant weight reduction without structured exercise programs, though the FDA has approved them as adjuncts to reduced-calorie diet and increased physical activity

That glucagon component significantly increases energy expenditure and fat oxidation, but also drives higher GI side effect rates at elevated doses