Obesity as an Intermediate Step

A very large number of veterans have a service-connected mental health condition, gained a great deal of weight afterwards, and were later diagnosed with obstructive sleep apnea. The claim is filed. The C&P examiner writes that there is no direct causal relationship between PTSD and sleep apnea. The claim is denied. In a meaningful number of those cases, the wrong question was answered — because the argument was never about a direct relationship.

Start with the rule that trips everyone up

In VAOPGCPREC 1-2017, VA's Office of General Counsel concluded that obesity is not a disease or injury for the purposes of 38 USC §1110 and §1131, and is not a disability for VA compensation purposes.

The consequences are absolute:

• You cannot get a disability rating for obesity.
• You cannot service connect obesity directly.
• You cannot service connect obesity as secondary to anything, because there is no compensable disability there to connect.

What an intermediate step is

The same General Counsel opinion went on to a second, far more useful conclusion. Although obesity is not itself compensable, it can operate as an intermediate step in a causal chain for the purposes of secondary service connection under 38 CFR §3.310(a).

The chain looks like this:

1. A service-connected disability causes the veteran to gain significant weight;
2. That weight gain causes, or substantially contributes to causing, a second condition;
3. That second condition is a real, diagnosed, ratable disability — and it is what gets service connected.

The compensation attaches at the end of the chain. Obesity is the connective tissue in the middle. That is the whole idea, and once it clicks, a great many previously hopeless-looking denials start to look like arguable claims.

The three questions

VAOPGCPREC 1-2017 frames the analysis as three sequential questions. This is the structure a rating specialist is supposed to work through, and it is therefore the structure your medical opinion should mirror, in order, in so many words.

If all three are answered in the affirmative, the second disability may be service connected on a secondary basis. The opinion is published with VA's other precedent opinions in the Office of General Counsel's precedent opinion index.

Note question three. That is a but-for question, written into VA practice in 2017 — six years before the Federal Circuit generalised the same framing in Spicer. The intermediate-step theory has always been a but-for theory. See our page on Spicer and the but-for standard.

The classic chain, worked through

Service-connected PTSD → weight gain → obstructive sleep apnea. Every link needs its own evidence and its own sentence in the opinion.

Link one: the condition caused the weight gain

This is not a matter of asserting that PTSD makes people gain weight. It is a matter of showing that it did so here, through identifiable mechanisms that appear in your own records:

• Medication. Several classes of psychiatric medication are associated with weight gain. If you were prescribed one, the drug name and the start date belong in the argument, and the weight curve should be read against that date.
• Activity restriction. Avoidance, hypervigilance in public spaces, and anhedonia reduce physical activity. If your treatment notes describe withdrawal or stopping exercise, that is evidence.
• Sleep disruption and appetite change. Documented in mental health notes far more often than veterans realise.
• Pain from a co-existing service-connected orthopaedic condition where one exists. A service-connected back or knee that stopped you exercising is frequently a stronger link-one argument than the mental health condition alone, and both can be argued together.

Link two: the weight gain caused or substantially contributed to the apnea

Of the three links this is usually the least contested, because the association between body habitus and obstructive sleep apnea is well established in the medical literature. But the opinion still has to apply it to you — your sleep study, your AHI, your neck circumference, your BMI at the time of diagnosis — and not merely recite that obesity is a risk factor for sleep apnea.

Link three: it would not have occurred but for that weight gain

The link most opinions skip, and the one an adjudicator can most easily use to deny the claim. The provider needs to consider the other explanations — age, sex, family history, craniofacial anatomy, alcohol use — and explain why they do not account for the diagnosis on their own. An opinion that ignores the obvious alternative explanations invites a rating specialist to supply them.

The weight timeline

This is the exhibit that decides these claims and almost nobody assembles it. Build a single chronological table before you file, drawing on:

• Entrance and separation examination weights from your service treatment records — your baseline, in a document VA already accepts;
• Every weight and BMI reading in your VA and private treatment records, because weight is recorded at essentially every visit and nobody ever looks at it in sequence;
• The date the service-connected condition was diagnosed or began being treated;
• Start and stop dates for every relevant medication;
• The date of the sleep study or the diagnosis of whatever the claimed end condition is.

Laid out in one table, the sequence often speaks for itself. A stable weight through service, an inflection point that lines up with the onset of treatment for the service-connected condition, and a diagnosis some years after that, is a far more persuasive document than any amount of argument. Give the timeline to the provider writing the opinion. They cannot describe a pattern they have not been shown.

How to plead it so it is not denied

1. Claim the end condition, not the obesity. "Obstructive sleep apnea, secondary to service-connected PTSD."
2. State the chain in the claim itself. In the statement in support of the claim, write it out: the service-connected condition and its treatment caused substantial weight gain, and that weight gain caused the sleep apnea. Cite VAOPGCPREC 1-2017 by name. It is VA's own opinion, and naming it makes it much harder for the file to be processed as though the theory were never raised.
3. Attach the weight timeline as an exhibit.
4. Get a medical opinion structured to the three questions. Not one paragraph covering all of it — three separate answers, each with its own rationale, in the order the General Counsel opinion sets them out.
5. Ask the opinion to address aggravation too. Even where causation is the primary theory, a sentence on whether the service-connected condition aggravated the claimed condition beyond its natural progression costs nothing and preserves the alternative. See secondary aggravation claims.

Why these claims get denied

• The examiner answered the direct question only. "There is no medical nexus between PTSD and obstructive sleep apnea." That may well be true of a direct link and entirely beside the point when the theory is an intermediate step. If the examination request never mentioned the chain, the examiner had no reason to consider it.
• Obesity was treated as the claimed disability. The decision explains that obesity is not a disability under VAOPGCPREC 1-2017 and denies the claim on that basis — which is a correct statement of law applied to a claim you did not make.
• Only one link was evidenced. Strong evidence that obesity causes sleep apnea, nothing at all on why the service-connected condition caused the obesity. The chain breaks at link one.
• The but-for question went unanswered. The examiner concedes contribution but never addresses whether the condition would have arisen anyway.
• No weight evidence. The assertion of significant weight gain appears nowhere in the record except the veteran's own statement.

After a denial

Read the reasons and bases paragraph closely and identify which of the above happened. It changes the lane.

• The examiner never considered the chain, and you never raised it. File a supplemental claim with the weight timeline and a properly structured private opinion. That is new and relevant evidence, and it is the cleanest route.
• You raised the chain and VA ignored it. That is an error on the record. Higher-level review is available, and the failure to obtain an adequate opinion on a theory reasonably raised by the record can be argued as a duty-to-assist error.
• The examination was inadequate. An opinion that answers a question nobody asked, or gives a conclusion with no rationale, is challengeable on its own terms — see inadequate C&P exams.

Which lane you choose has consequences for your effective date, so it is worth thinking about before you file rather than after.

Where the law is still open

VAOPGCPREC 1-2017 is framed in terms of causation under §3.310(a). Whether the same three-question structure extends to aggravation under §3.310(b) — obesity caused by a service-connected condition worsening a pre-existing second condition — is a further question, and it has been litigated at the Court of Appeals for Veterans Claims, including in Walsh v. Wilkie, 32 Vet. App. 300 (2020). We would not tell you this is settled. It is worth pleading in the alternative, with the expectation that it may be contested.

Other chains this theory supports

Sleep apnea is the best-known application, but the intermediate-step logic is not limited to it. Wherever a service-connected condition plausibly drove significant weight gain, and that weight gain plausibly drove a second diagnosis, the same three questions apply:

• Knee, hip and back conditions. Increased mechanical load on joints, particularly where the primary is itself an orthopaedic condition that reduced activity.
• Hypertension. A recognised consequence of substantial weight gain, though as with any multifactorial condition the but-for question needs a careful answer.
• Type 2 diabetes. Where the weight history supports it and other causes can be reasoned through.
• GERD. Intra-abdominal pressure from significant weight gain, often alongside a medication pathway.

Each of these lives in our conditions library with its rating criteria. And if you want to see what adding one would do alongside your existing ratings, the combined ratings calculator will show you.

What we do with these

We build the timeline, identify which links are weak, and commission a medical opinion that answers all three General Counsel questions in order rather than one of them in general terms. Where a C&P examiner has answered the direct question instead of the one you raised, we say so, in the language the regulation uses.