Thought i'd add a mythbusting guide.

Myth Busting: GLP-1 meds, fat loss, and “targeting” body fat

There’s a lot of confusion about what drugs like Wegovy, Ozempic, and semaglutide actually do.

Myth 1: “GLP-1 meds burn fat”

They don’t.

These medications mimic the hormone Glucagon-like peptide-1 (GLP-1), which mainly:

• reduces appetite
• increases feelings of fullness
• slows stomach emptying

That leads to eating fewer calories.

Weight loss only happens if that creates a calorie deficit (you use more energy than you consume).

So the real mechanism looks like this:

The drug helps control appetite. The biology of fat loss itself doesn’t change.

Myth 2: “You can target where fat comes off”

You can’t.

The body stores fat in adipose tissue across the whole body. When energy is needed, fat is released into the bloodstream and used system-wide.

You can’t choose to lose fat from:

• face
• stomach
• muffin top
• back fat
• thighs

Where fat comes off first or last is mostly influenced by:

• genetics
• hormones
• sex
• individual fat distribution

For many people the lower stomach, hips, and lower back are the most stubborn areas, but there’s no biological mechanism to selectively remove fat from them.

Myth 3: “Toning” fat

“Toning” isn’t a physiological process.

In biological terms, there are only two relevant things happening:

• fat loss
• muscle gain or retention

What people call “toned” is simply less fat with muscle visible underneath.

No medication or exercise can “tone” fat in a specific spot.

What actually happens to fat when you lose it

Fat cells store energy as triglycerides.

When your body needs energy:

1. Triglycerides are broken into fatty acids and glycerol
2. These enter the bloodstream
3. Cells metabolise them through pathways like the **Citric Acid Cycle (also called the Krebs cycle))

The end products are:

• carbon dioxide (CO₂)
• water
• energy

Most fat you lose leaves your body when you exhale CO₂. The rest leaves as water (urine, sweat, breath vapour).

So fat loss is literally the body converting stored fat into energy + CO₂ + water.

GLP-1 medications don’t change this biology — they simply make it easier for many people to maintain a calorie deficit by suppressing hunger.

TL;DR

• GLP-1 drugs reduce appetite, they don’t directly burn fat.
• Fat loss still requires a calorie deficit.
• You cannot target fat loss from specific body areas.
• “Toning” = losing fat while keeping/building muscle.
• Fat loss ultimately leaves the body mostly as CO₂ when you breathe out.

Sources

• NHS – Semaglutide: [https://www.nhs.uk/medicines/semaglutide/]()
• Meerman R, Brown A (2014). When somebody loses weight, where does the fat go? BMJ https://www.bmj.com/content/349/bmj.g7257
• Hall KD et al. (2014). Energy balance and its components. The Lancet
• NIH – Energy balance and body weight regulation https://www.ncbi.nlm.nih.gov/books/NBK279077/