What fraction of loss on dulaglutide is lean mass according to STEP 3?

Question

Stated plainly: dulaglutide · STEP 3. I have read the primary source rather than the summary, which has left me with more questions. I understand the headline. I do not understand the footnotes, and the footnotes look important. What would I need in addition before this supported a decision?

vialroom · Accepted Answer

To be exact about it, a plateau at four to six months is the expected shape of the curve, not a failure of it. Energy expenditure falls with mass, and the deficit closes itself unless intake falls further. Absolute strength holds up better than scale weight during a deficit for a straightforward reason: strength is substantially neural and skill-based, and the contractile tissue you retain is being trained harder relative to its size. Grip strength and repetition maxima are therefore lagging indicators of muscle loss rather than leading ones, which is an argument for measuring both. Protein target arithmetic Body mass 1.2 g/kg 1.6 g/kg 2.0 g/kg Per meal at 1.6 (÷3) 62 kg 74 g 99 g 124 g 33 g 74 kg 89 g 118 g 148 g 39 g 88 kg 106 g 141 g 176 g 47 g 103 kg 124 g 165 g 206 g 55 g 124 kg 149 g 198 g 248 g 66 g At roughly 4 kcal per gram, 141 g of protein is about 564 kcal — a substantial fraction of a 900 kcal budget, which is the real constraint. The minimum effective resistance-training dose in a deficit is lower than most programmes assume. Two sessions a week covering the major movement patterns, with loads taken close to failure, is sufficient to retain most of what would otherwise be lost. Volume beyond that adds recovery cost that a large energy deficit is poorly placed to pay. The evidence for a higher protein intake preserving lean mass during an energy deficit is reasonably strong in resistance-trained populations and weaker in sedentary ones, with the meta-analytic estimates supporting intakes in the region of 1.6 g/kg over lower intakes when training is present [1] . One qualification: none of this is a clinical assessment, and unexplained loss of function rather than of mass is a reason to see someone rather than to adjust a programme. Two resistance sessions a week and a protein target you actually hit will do more than any refinement beyond them.

k_szabo · Answer

Mechanically, the distinction that resolves this is between proportional loss and functional loss. Losing lean mass in proportion to total mass is what happens in every weight loss intervention. Losing function is not, and function is measurable.

DEXA precision is better than people assume for fat mass and worse than people assume for lean mass in a single scan — the least significant change for regional lean mass on a well-maintained scanner is on the order of a few per cent. That means two scans three months apart can differ without anything having happened, and it means a scan sequence needs to be at least three points before a trend is interpretable.

Food noise returning is not obviously tolerance. Receptor desensitisation is one hypothesis; a second is that the initial effect was partly novelty and partly the steep early deficit, and a third is that intake has drifted upward and the signal is being outcompeted rather than weakened. The three make different predictions about what a dose increase would do.

I would be careful with the supplement literature here; effect sizes are small, the studies are mostly in trained young men, and generalisation to a large deficit is not obviously valid.

A maintenance plan written before you need it is worth more than a better loss plan.

shareimprove this answerflag

answeredk_szabo45k3815 Mar 2026

tobias_maartens · Answer

The part that matters: start with the arithmetic, because the answer to the practical question is usually a number and the number is usually achievable.

The first four weeks of loss is substantially fluid and glycogen. Each gram of stored glycogen carries roughly three grams of water, and total glycogen is on the order of 400 to 500 g, so the obligatory water shift alone accounts for a couple of kilograms. This is why the first month looks dramatic and the second looks like a plateau when in fact the fat-loss rate has not changed.

Put another way, protein target, worked: at 88 kg, a target of 1.6 g/kg is 88 × 1.6 = 141 g per day. Spread across three eating occasions that is roughly 47 g each, and the leucine threshold for a maximal muscle protein synthetic response is met at around 2.5 to 3 g of leucine, which corresponds to roughly 30 to 40 g of a high-quality protein. So three meals at 40 g plus one 25 g snack gets you to 145 g and clears the per-meal threshold each time. On 900 kcal that leaves about 340 kcal for everything else, which is the actual constraint.

SURMOUNT-4 provides the cleanest maintenance-versus-withdrawal contrast available in the class, and it is the reference for any claim about what happens after stopping[1].

The plateau is arithmetic. Treat it as arithmetic and the response follows.

shareimprove this answerflag

answeredtobias_maartens94k25826 Mar 2026

rania_haddad · Answer

The mechanism is worth having straight, because it predicts which interventions can work and which cannot.

Fibre at very low total intake is a trap. Soluble fibre needs water and motility to work; insoluble fibre adds bulk to a slow transit. At 900 kcal a day with delayed gastric emptying, an osmotic agent is more predictable than a bulking one, and adequate fluid is doing more work than either.

The STEP 1 extension reported substantial regain in the year after treatment withdrawal, with weight and cardiometabolic variables trending back toward baseline[1].

Train, eat the protein, measure something functional, and give the trend three months before you interpret it.

shareimprove this answerflag

answeredrania_haddad17k2817 Apr 2026

8The arithmetic checks out. I ran the same numbers and got the same result. – Dr_Priya_Raghunathan 7 months ago

add a comment

mz_4113 · Answer

The commonly quoted figures for lean-mass loss are mostly measurement artefacts, and the artefact is well understood: fat-free mass as measured includes water and glycogen, both of which fall early and neither of which is contractile tissue.

Hydration state moves a DEXA lean-mass figure directly, because the algorithm assigns water to the lean compartment. Scanning fasted, at the same time of day, before training and without a recent high-carbohydrate day is the difference between a comparable sequence and a noisy one. Bioelectrical impedance is far more sensitive to hydration again, which is why its trend is unusable at this timescale.

The body-composition substudies in the major programmes consistently report that the proportion of weight lost as fat mass is approximately three quarters or better, with the lean-mass fraction falling within the range seen in dietary weight loss of comparable magnitude[1].

Measure strength as well as mass. It is cheaper, it is less noisy, and it is closer to what you actually care about.

shareimprove this answerflag

answeredmz_411399k25814 Jun 2026

What fraction of loss on dulaglutide is lean mass according to STEP 3?

lean-mass

muscle-loss

dexa

5 Answers

Protein target arithmetic

Janoshik Analytical - Independent Third-Party Testing

GL Biochem (Shanghai) Ltd. - Direct Synthesis

Your answer

Browse

About

Body mass	1.2 g/kg	1.6 g/kg	2.0 g/kg	Per meal at 1.6 (÷3)
62 kg	74 g	99 g	124 g	33 g
74 kg	89 g	118 g	148 g	39 g
88 kg	106 g	141 g	176 g	47 g
103 kg	124 g	165 g	206 g	55 g
124 kg	149 g	198 g	248 g	66 g