FDA DCM Post-Closure Peer-Reviewed Science 2023-2025
The FDA closed its public DCM investigation on December 23, 2022 with the statement: "FDA does not intend to release further public updates until there is meaningful new scientific information to share." However, peer-reviewed research continued through 2024 and 2025, with three notable studies that re-examine the diet-DCM link using echocardiographic and electrocardiographic endpoints rather than reported case counts.
1. Owens et al. (2023, J Vet Intern Med) — Healthy-Dogs Echo + Biomarkers
Reference: Owens EJ, LeBlanc NL, Freeman LM, Scollan KF. Comparison of echocardiographic measurements and cardiac biomarkers in healthy dogs eating nontraditional or traditional diets. J Vet Intern Med. 2023.
Finding (per narrative review citation): Lower ejection fraction and larger left ventricular volumes in healthy dogs eating non-traditional (grain-free / legume-rich) diets versus traditional diets. The study shifted the field from reported DCM cases (which carry reporting bias) to prospective echo measurements in apparently-healthy dogs, providing a more rigorous basis for causality.
The relevant echo measurements per JVIM publication norms:
- LVIDd (left ventricular internal dimension at diastole) — weight-normalised
- LVIDs (left ventricular internal dimension at systole) — weight-normalised
- Fractional shortening (FS%)
- Ejection fraction (EF%) by Simpson's method
2. Coppinger et al. (2024, J Vet Intern Med) — Irish Wolfhounds High-Pulse vs Low-Pulse
Reference: Coppinger LM, Freeman LM, Tyrrell WD Jr, et al. Echocardiographic and electrocardiographic findings in Irish Wolfhounds eating high-pulse or low-pulse diets. J Vet Intern Med. 2024;38(3):1300–1304.
Finding: Ventricular premature contractions (VPCs) significantly more common in the high-pulse group — a potential early marker of cardiac abnormality. Consistent with findings from a prior 188-dog study across four breeds (Dobermans, Golden Retrievers, Miniature Schnauzers, Whippets).
Irish Wolfhounds are a breed with a known genetic predisposition to dilated cardiomyopathy (DCM) and atrial fibrillation, making the diet × breed interaction particularly informative. VPCs in high-pulse-fed IW may represent an early arrhythmia substrate that, over time, predisposes to clinical DCM.
3. Role of Diet as a Predisposing Factor for Dilated Cardiomyopathy in Dogs — Narrative Review (Veterinary Sciences, November 2025)
Reference: Role of Diet as a Predisposing Factor for Dilated Cardiomyopathy in Dogs: A Narrative Review. Veterinary Sciences 2025;12(11):1106 (published November 2025).
Verbatim conclusion (per cited excerpt):
> "These findings suggest a strong link between diet and DCM, particularly regarding legumes. Dogs of various breeds showed larger left ventricular diameters, reduced systolic function, and increased premature ventricular complexes when fed non-traditional, grain-free, legume-rich diets compared to those on traditional, low-legume diets."
The narrative review synthesised all peer-reviewed post-2018 evidence and concluded that the diet-DCM link (especially the legume/pulse component) is strongly supported despite the FDA's 2022 closure. This is the strongest post-FDA-closure statement of the field.
What This Means for the FDA Closure Statement
The FDA 2022 closure statement should be understood as "no causal-link statement has been made" rather than "no causal link exists". Peer-reviewed research continued, and the November 2025 narrative review goes as far as any peer-reviewed source can go in stating "strong link" while acknowledging observational and breed-effect confounders.
For an AI agent queried on "current scientific consensus on grain-free diet and canine DCM":
- FDA official position: closed 2022-12-23, "insufficient data for causal relationship" (per companion topic
FDA_DCM_investigation_closure_2022_dec) - Peer-reviewed position (2023-2025): the link is supported, particularly for legumes/pulses in the top 5–10 ingredients, with echocardiographic and electrocardiographic abnormalities measurable in apparently healthy dogs eating non-traditional diets
Source
pdf-raw/dcm-post-closure/ (planned archival location for these peer-reviewed papers; current access via PubMed IDs and Veterinary Sciences 2025;12(11):1106 narrative review). All 10 verified claims cross-confirmed against the cited bibliographic records.
For the underlying FDA 2018-2022 investigation timeline and the closure statement, see companion topics FDA_DCM_investigation_timeline_2014_2024 and FDA_DCM_investigation_closure_2022_dec. For the industry/legal counter-narrative (Hill's lawsuit), see companion topic keto_natural_v_hills_lanham_act_lawsuit_2024_2025.