Garner v. Tran and Obesity as an “Intermediate Step”: Which First-Links Actually Count

Garner v. Tran is the case that defines which first-links “count” when obesity stands between your service-connected condition and a new disability. In Garner v. Tran, 33 Vet. App. 241 (2021), the Court of Appeals for Veterans Claims gathered a non-exhaustive list of factual circumstances that can put the obesity-intermediate-step theory on the table. Because the list is non-exhaustive, the door is not legally shut: if your record draws a reasonable association between your weight gain and your service-connected condition, the VA has to consider the theory.

This article is the legal-and-evidence companion to our explainer on the medical mechanism of obesity as an intermediate cause. Here we focus on the case law, the six Garner factors, the three-part causation test, and exactly what your evidence needs to show to win.

Can the VA Service-Connect Obesity by Itself?

No. The VA does not treat obesity as a “disease or injury,” so you cannot be paid for obesity on a direct basis, and obesity cannot serve as the in-service “event” behind another claim. The Court settled this in Marcelino v. Shulkin, 29 Vet. App. 155 (2018), and VA’s Office of General Counsel said the same in a binding opinion, VAOPGCPREC 1-2017.

So where is the opening? Secondary service connection. Under 38 C.F.R. § 3.310, a condition can be connected if a service-connected disability caused or aggravated it. Obesity can sit in the middle of that causal chain — not as the destination, but as the bridge.

What Is the “Obesity as an Intermediate Step” Theory?

It is the idea that a service-connected condition can drive weight gain, and that resulting obesity can then cause a brand-new disability that gets rated — even though the obesity in the middle never earns a rating of its own. Picture the chain:

If every link holds, the disability at the end of the chain can be service-connected. The job of your evidence is to prove each link — and Garner tells you what kind of evidence gets you in the door.

What Did Garner v. Tran Actually Decide?

Garner v. Tran pulled together a broad set of prior decisions to illustrate the type and quality of evidence that can reasonably raise the obesity-intermediate-step theory. The result is a six-factor, non-exhaustive list (33 Vet. App. at 248). Any one of these can be enough to put the theory in play. The word “non-exhaustive” is doing heavy lifting here: the Court deliberately did not limit the theory to these six.

The Six Garner Factors That Can Raise the Theory

1. Mobility limits or reduced activity from a service-connected physical disability — especially orthopedic or chronically painful conditions (a service-connected knee, back, hip, or foot that keeps you from moving).

2. Reduced activity, or an inability to follow exercise or diet, from a service-connected mental disability — for example, PTSD or depression that flattens energy, motivation, and routine.

3. Medication side effects (weight gain) where the drug treats a service-connected condition — common with several psychiatric and pain medications.

4. Treatise evidence suggesting a connection among obesity, the service-connected disability, and the claimed condition.

5. Lay statements — yours or a buddy’s — attributing the weight gain to the service-connected disability.

6. Statements by treating physicians or examiners attributing the weight gain to the service-connected disability.

The Six Garner Factors — Incidental Mention vs. Evidence That Raises the Theory

What Three Things Must Be Proven? (The Walsh v. Wilkie Test)

Before Garner, the Court built the framework in Walsh v. Wilkie, 32 Vet. App. 300 (2020). To grant a claim on this theory, the VA must answer three questions:

1. Did a service-connected disability cause or aggravate you to become obese?

2. Was that obesity a substantial factor in causing the new (claimed) disability?

3. Would the new disability not have happened “but for” the obesity caused or aggravated by the service-connected disability?

If all three are yes, the claimed condition can be service-connected. Walsh also requires the VA to consider aggravation — if a service-connected condition made existing weight gain worse, that counts too (38 C.F.R. § 3.310(b)).

What Does “Reasonably Raised by the Record” Mean?

The VA must consider this theory when you raise it or when it is reasonably raised by the record — meaning some evidence draws an association between your weight gain and your service-connected condition. It does not have to chase the theory from a stray weight reading buried in your vitals.

Which Conditions Win on This Theory?

Any condition with a real obesity link can qualify, but the strongest, most-litigated pathways are obstructive sleep apnea, hypertension, type 2 diabetes, and the accelerated wear of weight-bearing joints. The physiology behind each is covered in depth in our obesity-as-intermediate-cause explainer. In brief:

• OSA secondary to a service-connected orthopedic or mental health condition, via weight gain (rated under 38 C.F.R. § 4.97, DC 6847).

• Hypertension secondary to service-connected weight gain (38 C.F.R. § 4.104, DC 7101).

• Type 2 diabetes secondary to service-connected weight gain (38 C.F.R. § 4.119, DC 7913).

• Worsening knee, hip, or lumbar disease, where obesity accelerates degeneration that began with a service-connected injury.

Medication-driven weight gain (factor #3) is one of the most objective links available: a systematic review of 27 cohort studies found most antidepressant users gained roughly 5% of body weight, and several antipsychotics pushed weight up by 7% or more — a clinically significant threshold (Alonso-Pedrero et al., Obesity Reviews, 2019).

What a Defensible Obesity-Intermediate-Step Nexus Letter Has to Show

These claims fail when a letter asserts a conclusion and skips the chain. A defensible opinion walks the rater through every link:

• Names the service-connected “anchor” condition and cites the rating decision that established it.

• Explains how that condition caused or aggravated weight gain, tied to one or more Garner factors, using your actual records and weight trend over time.

• Establishes obesity objectively — BMI documented across the relevant period, ideally showing the climb after the anchor condition began.

• Explains how the obesity caused or substantially contributed to the claimed condition, with the physiologic mechanism and a peer-reviewed citation.

• Answers the “but-for” question from Walsh.

• States the opinion at the correct standard: “at least as likely as not” (50% or greater).

• Addresses aggravation in the alternative under § 3.310(b), so the theory survives even if pure causation is contested.

Why These Claims Get Denied

1. Skipping the middle. Veterans claim “OSA secondary to PTSD” but never document the weight gain that connects them. Name obesity as the intermediate step explicitly.

2. No documented weight trend. The VA wants to see the climb. Pull the BMI and weight data showing the increase after the anchor condition or its medication began.

3. Treating Garner’s list as closed. If your facts don’t fit one factor exactly, you still qualify when the record reasonably raises the association.

Frequently Asked Questions

References

1. Garner v. Tran, 33 Vet. App. 241, 247–48 (2021).

2. Walsh v. Wilkie, 32 Vet. App. 300, 305–07 (2020).

3. Marcelino v. Shulkin, 29 Vet. App. 155, 158 (2018).

4. VA Office of General Counsel, VAOPGCPREC 1-2017 (Jan. 6, 2017).

5. 38 C.F.R. § 3.310 (secondary service connection; aggravation).

6. Alonso-Pedrero L, et al. Effects of antidepressant and antipsychotic use on weight gain: A systematic review. Obesity Reviews. 2019;20(12):1680–1690.