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How effective are weight loss injections?

Do weight loss injections really work? See what the evidence shows: tirzepatide delivering ~15–21% average loss at 72 weeks and semaglutide averaging 15.3 kg—plus why results improve most with lifestyle support and medical oversight.

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· by Dr. Ketikian
How effective are weight loss injections?

Tirzepatide

A meta-analysis of six trials involving over 4000 participants revealed that Tirzepatide stands out as a powerful tool in the fight against overweight and obesity. In one randomized trial, over 2500 adults with obesity, but without diabetes, were treated with Tirzepatide at doses of 5, 10, and 15 mg over 72 weeks. The results were astounding, with participants experiencing significant weight loss ranging from 15% to 20.9%. Tirzepatide comes in the form of Zepbound for the treatment of overweight and obesity.

Semaglutide

Semaglutide isn’t new to the weight loss ring, but its track record is solid. The STEP 1 trial enrolled nearly 2,000 adults. For 68 weeks, one group received weekly Semaglutide injections, while the other got a placebo (think of it as a sugar pill). The results were clear winners: The semaglutide group shed an average of 15.3 kg (33.7 lbs)! Here’s the breakdown of their success:

  • 86.4% lost at least 5% of their body weight, high fives all around!
  • 69.1% achieved a double-digit weight loss (10% or more), that’s double the cause for celebration!
  • A remarkable 50.5% experienced a weight reduction of 15% or more, we’re talking confetti and parades for these champions!

The Science Behind the Success Story

These injections aren’t magic bullets, but they work by influencing your body’s natural weight regulation system. They target hormones that control appetite and metabolism, essentially whispering to your body, “Hey, you’re not that hungry, and you’re burning calories like a boss!” This translates to less desire to raid the pantry and a more efficient calorie-burning machine. Imagine it as turning down the volume on your hunger pangs while revving up your glucose metabolism’s engine. In addition, slowing the emptying of your stomach helps you feel fuller longer.

It’s Time to Take Charge

The message is clear: weight loss injections like Tirzepatide and semaglutide can be a game-changer. They offer significant weight loss, giving you the edge you need to finally conquer that weight loss mountain.

These injections are tools, best used under the guidance of a healthcare professional with the addition of lifestyle modifications in order to achieve long term sustainable weight loss success.

Final Thoughts

Tirzepatide and semaglutide consistently produce clinically meaningful weight loss in trials, especially when paired with nutrition, activity, sleep, and follow-up care. If you’re considering this path, discuss candidacy, expectations, and monitoring with your clinician—then use the medication as one part of a comprehensive plan for durable results.

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Disclaimer: The information provided on this website, including blog posts, is for general educational and informational purposes only and is not intended as medical advice. As a board-certified physician, I aim to share insights based on clinical experience and current medical knowledge. However, this content should not be used as a substitute for individualized medical care, diagnosis, or treatment. Always consult your own healthcare provider before making any changes to your health, medications, or lifestyle. marmean and its affiliates disclaim any liability for loss, injury, or damage resulting from reliance on the information presented here.

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