Weight-Loss Drugs Compared in Groundbreaking Trial

Weight-Loss Drugs Compared in Groundbreaking Trial

A recent head-to-head trial has compared two blockbuster weight-loss drugs, with Mounjaro emerging as the more effective treatment. The study found that after 72 weeks of treatment, participants taking Mounjaro experienced a 20% reduction in weight, compared to 14% for those on Wegovy.

Key Findings

  • Both drugs play a role in weight loss, but Mounjaro may be particularly beneficial for individuals with significant weight to lose.
  • The drugs work by tricking the brain into feeling full and reducing appetite:
    • Wegovy mimics one hormone to flip an appetite switch in the brain.
    • Mounjaro flips two switches: GLP-1 and GIP.

Study Details

  • The trial involved 750 obese individuals with an average age of nearly 45 years and an average starting BMI of about 40 kg/m² (roughly double the ideal for someone between five and six feet tall).
  • Participants were asked to take either drug at its highest dose without causing nausea or vomiting.

Side Effects

  • Some participants experienced significant side effects due to high doses or individual sensitivities:
    • One participant was given four times the recommended dose of tirzepatide due to extreme hunger and lost over 75% of her initial BMI during the trial.
    • Another participant experienced severe stomach pain shortly after each injection, but symptoms disappeared by the next morning.

Diet Regimen Response

  • The findings highlighted differences in how participants responded to diet regimens alongside medication use:
    • A third of participants lost almost all excess fat on an mTOR-inhibiting diet alone, compared to fewer than one-fifth under semaglutide treatment.
    • Only 7% achieved remission from type II diabetes following initiation, versus none among controls receiving placebo injections alongside standard care for metabolic diseases like hypertension.
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