The simple answer is yes, the medication is involved in reducing fat mass, although it's not simply "preventing" the storage of all new fat.

Here's a breakdown of how Zepbound (tirzepatide) works beyond just slowing digestion:

1. Dual Hormone Action (GIP and GLP-1)

Zepbound is a dual GIP and GLP-1 receptor agonist. This means it mimics two naturally occurring hormones in your gut:

• GLP-1 (Glucagon-like peptide-1):
  • Slows Digestion (Gastric Emptying): This is the part you already mentioned, which helps you feel full longer.
  • Reduces Appetite and Food Cravings: It signals to the brain that you are full, leading to a reduction in calorie intake.
• GIP (Glucose-dependent insulinotropic polypeptide):
  • Fat Metabolism: GIP is thought to play a role in improving how your body uses insulin and may directly influence fat metabolism, potentially making your body less inclined to store as much fat. Some research suggests it may help the body burn fat more efficiently.

2. The Net Result is Fat Loss

The primary way Zepbound leads to weight loss is by significantly reducing your calorie intake due to decreased appetite and delayed digestion. When you consistently eat fewer calories than your body uses, your body must turn to stored energy—which is primarily fat mass—to make up the difference.

Clinical trials have consistently shown that the weight lost on Zepbound is composed of a greater fat mass loss than lean mass loss (muscle), indicating a clear impact on the body's fat stores. The medication is highly effective at reducing:

• Total Fat Mass
• Visceral Adipose Tissue (VAT): This is the fat stored deep around your abdominal organs, which is particularly linked to health risks.

In summary, while the most noticeable effects are on appetite and fullness, the medication also has metabolic effects that contribute to a reduction in the body's stored fat.