DEXA Scan During GLP-1 Weight Loss: Was It Worth It?

My answer: If you are losing a lot of weight on a GLP-1 drug like Zepbound, a DEXA scan can be worth it because it shows what the scale cannot: fat loss, lean mass, visceral fat, and fat distribution. In my case, the scale said I lost 35 lb over six months. DEXA showed something more useful: 44 lb of fat lost, 9 lb of lean mass gained, and visceral fat dropping from 147 cm² to 66 cm².

I tend to subscribe to the “no data like more data” mantra. This can obviously go too far into silly health “optimization”, but I think the case for getting regular DEXA scans during a major weight loss cut is actually very solid.

The scale told me I lost 35 lbs over the last 6 months.
DEXA tells me I lost 44 lbs of fat and gained 9 lbs of lean mass (I take that to mean “muscle” 🙂 ). That’s why I think it was worth doing. 

One important piece of context: I’m also on physician-prescribed TRT, and I see that as a good thing. My goal during this GLP-1 weight-loss phase was never just to make the scale go down. I wanted to lose fat, protect muscle, keep training hard, and come out healthier and stronger on the other side. TRT was part of that bigger plan, along with Zepbound, lifting, protein, and consistency.

I’m a 53-year-old male, 6’3”, prescribed Zepbound 12.5 mg/week and TRT 120 mg/week. My starting weight in October 2024 was 373 lbs when I got on Tirzepatide (Zepbound GLP-1) and startedD losing weight. By my first DEXA in October 2025, I was down to 245 lbs, and by my second in April 2026, I was 210 lbs. 

What made the DEXA valuable for me wasn’t just body fat percentage. The main numbers I cared about, in order, were:

1. Visceral fat (aka VAT area)

This was the big one. I really wanted to get below 100 cm² to be in the “low risk” category. My scan showed visceral fat area dropping from 147 cm² to 66 cm². That was probably the most satisfying number in the whole report. 

2. Body shape (aka. apple vs pear shaped, A/G ratio)

Second was android/gynoid ratio. I was aiming for under 1.0, and mine went from 1.39 to 0.96. To me, that says a lot more than body weight alone, because I care much more about central fat distribution than the scale. 

3. Body fat percentage

Third was body fat percentage, which came in at 15.6%. I’ll be honest: this one is at least partly a vanity metric. But I still care about it. According to the widely cited American Council on Exercise chart that makes me “fit” — Yay!

The other thing I liked about the DEXA is that it helped answer the question a lot of people have during aggressive weight loss especially on GLP-1RAs: am I losing too much lean tissue along the way? In my case, total fat mass dropped from 76 lbs to 32 lbs, while lean mass went from 162 lbs to 171 lbs. So the headline wasn’t just that I got lighter. It was that I appear to have lost 44 lbs of fat while gaining 9 lbs of lean mass!

That’s my argument for DEXA during big weight loss. I wouldn’t say everyone needs one, but it can tell you things the scale absolutely cannot:

Did visceral fat fall?
Did fat distribution improve?
Did you preserve lean mass?

I take my muscle gain and fat loss as validation that my GLP-1, TRT strategy plus building a convenient home gym for a 50 year old body worked out beautifully!

My one big regret is obvious: I wish I had gotten a baseline DEXA when I was 373 lbs back in November 2024.

Note: This is my personal experience, not medical advice. I’m a 53-year-old man sharing my own DEXA results during physician-prescribed Zepbound and TRT. Talk to your clinician before making medication, diet, or training decisions.