Obesity as an Intermediate Step in a VA Secondary Claim

VA can service-connect a condition such as sleep apnea, diabetes or hypertension when a service-connected disability caused or worsened obesity and that obesity led to the condition. VA's General Counsel recognized this "intermediate step" in 2017, the Court of Appeals for Veterans Claims held in 2020 that worsened obesity counts as well as caused obesity, and the Board of Veterans' Appeals has granted claims on it, including diabetes secondary to PTSD in January 2025. The limit is equally firm: obesity itself cannot be service connected or rated, so the claim has to prove every link in the chain, starting with the one in the middle.

The legal test: VA General Counsel Precedent Opinion 1-2017

VA General Counsel Precedent Opinion 1-2017 (January 6, 2017) held that obesity is not a disease or injury that can be service connected directly, and that obesity is not a "disability" for purposes of secondary service connection under 38 C.F.R. § 3.310. You cannot claim obesity secondary to a knee or to PTSD and receive a rating for it. But the opinion also held that obesity may be an intermediate step between a service-connected disability and a current disability that can be service connected on a secondary basis.

Using a back disability, obesity and hypertension as its example, the opinion said adjudicators must resolve three questions:

1. Did the service-connected disability cause the veteran to become obese?
2. If so, was that obesity a substantial factor in causing the claimed condition?
3. Would the claimed condition not have occurred but for obesity caused by the service-connected disability?

If all three are answered yes, the claimed condition may be service connected on a secondary basis. Each question needs its own evidence. "My weight went up" answers none of them by itself.

What Walsh and Garner added

In Walsh v. Wilkie, 32 Vet. App. 300 (2020), the Court held that there is no legal basis to recognize obesity caused by a service-connected condition while ignoring obesity aggravated by one. When the theory is raised, VA must consider whether a service-connected condition made existing obesity worse. The Court vacated and remanded the Board's denial. It did not itself grant the veteran's sleep apnea or hypertension.

In Garner v. Tran, 33 Vet. App. 241 (2021), the Court addressed when VA must consider the theory at all. It must be raised by the veteran or reasonably raised by the record, meaning some evidence draws an association between the obesity or weight gain and a service-connected condition. The Court listed examples, without limiting the theory to them:

• reduced mobility or activity because of a service-connected physical disability, especially orthopedic or chronically painful conditions;
• reduced activity or trouble following exercise or diet because of a service-connected mental disability;
• weight gain as a side effect of medicine prescribed for a service-connected disability;
• medical literature suggesting a connection among obesity, the service-connected disability and the claimed condition;
• the veteran's own statements attributing weight gain to the service-connected disability; and
• statements by treating physicians or examiners attributing weight gain to it.

In Garner itself, the Court found the theory had not been reasonably raised, though it remanded for other reasons. If you intend to rely on it, say so plainly in the claim rather than hoping a rater finds it.

What the Board did in a diabetes-through-obesity appeal

In A25005350 (January 22, 2025), the veteran said his PTSD led to loss of motivation and comfort eating, and to rapid weight gain after service that led to diabetes. A nurse practitioner reviewed the claims file, service records, prior exams and the veteran's statements, cited studies linking PTSD with obesity and obesity with diabetes, documented a weight gain of about 91 pounds since active duty, and concluded that the veteran more than likely would not have developed diabetes but for his weight gain and obesity, and that the weight gain was at least as likely as not related to PTSD.

Two VA opinions went the other way. One said flatly that PTSD does not cause diabetes and that the veteran was not overweight, citing a body mass index of 26 in 2012. The Board pointed out that a BMI of 26 is in the overweight range, that VA records showed new-onset diabetes in March 2009 with a BMI of 29.6, and that a clinician had called him overweight months earlier. It found that opinion inadequate for ignoring the weight history. The second VA opinion did not address the literature or the veteran's facts. The Board found the private opinion the most probative and granted diabetes secondary to PTSD.

The middle link won that case: a documented weight history, placed on an accurate timeline, with an opinion that answered the "but for" question in plain terms. A different Board decision, granting sleep apnea secondary to PTSD with obesity as the intermediate step, is analyzed in the sleep apnea secondary to PTSD case study. There, the Board gave little weight to VA opinions that did not address weight gain as an intermediate step or aggravation.

For context, Claim Raven's analysis of Board decisions shows secondary claims granted in 35.1% of 19,189 condition records and remanded in 41.5%, compared with 41.2% granted for 40,026 direct claims. Within secondary claims, opinions the Board described as strong went with favorable outcomes in 94.1% of 2,973 records, against 1.7% where the opinion was weak and 0.5% where there was none. These are outcomes in already-disputed Board appeals from mostly 2024 to 2025, and Claim Raven does not report a separate figure for obesity chains, so they describe patterns, not your odds.

Map your chain before asking for an opinion

A blank row is a warning that the record may not support that link yet. Weight readings at routine visits, medication lists showing a drug known to cause weight gain, and notes about lost mobility are the usual sources for the middle link. If the final condition is sleep apnea, the National Heart, Lung, and Blood Institute lists obesity among several causes and risk factors, alongside age, airway anatomy, alcohol and smoking, so the opinion should say why weight, rather than another factor, drove your case. Do not change treatment or weight to make a claim theory look stronger.

Questions for the clinician about an obesity chain

• Did my service-connected disability, or its treatment, cause my weight gain, or make existing obesity worse?
• Was the obesity a substantial factor in the final condition, and would that condition have occurred without it?
• What other causes of the weight gain and the final condition did you consider?
• Which link can the record support, and what additional evidence would change your answer?

The guide to nexus letters for secondary conditions explains how to present causation and aggravation for any secondary opinion. For the sleep apnea version of this chain, the sleep apnea secondary to PTSD nexus letter page lists what the opinion usually covers, and the sleep apnea, diabetes and hypertension guides cover how each final condition is rated.

Sources and scope

Checked September 23, 2026: VA General Counsel Precedent Opinion 1-2017; the Walsh and Garner opinions from the Court of Appeals for Veterans Claims, with reporter citations as the Board cites them in A25000430 and A25016124; the current eCFR text of 38 C.F.R. § 3.310; NHLBI's sleep apnea causes page; and the full text of Board decision A25005350, which binds only that appeal. Claim Raven sells the nexus readiness check offered with this guide and has a commercial interest in its use.