Assessment of immune function in individuals without and with obesity and normoglycemia, glucose intolerance, or type 2 diabetes: primary findings of the NutrIMM study, a single-arm controlled feeding trial
Bibliographic record
Abstract
BACKGROUND: Obesity and type 2 diabetes (T2D) are associated with immune dysfunction, increasing infection susceptibility and impairing immune responses. However, the independent effects of obesity and hyperglycemia on immune dysregulation remain unclear, particularly under controlled dietary conditions. OBJECTIVES: The Nutrition and Immunity study investigated the effects of obesity and hyperglycemia on immune cell function, phenotype, and systemic inflammation in individuals with obesity with or without T2D, compared with lean individuals with normoglycemia. METHODS: This single-arm controlled feeding trial included 112 participants across 4 groups: lean-normoglycemic (Lean-NG), obese-normoglycemic (OB-NG), obese-glucose intolerant (OB-GI), and obese-T2D. Participants followed a standardized isocaloric North American diet for 4 wk. Blood samples were collected at baseline and week 4. One-way and repeated measures analysis of variance assessed group differences and/or dietary effects. Linear regression analyses examined associations between glucose control and immune function. RESULTS: C-reactive protein levels were higher in the OB-NG group [mean difference (MD): 4.1 mg/L; 95% confidence interval (CI): 1.7, 6.6], OB-GI group (MD: 3.1 mg/L; 95% CI: 0.82, 5.4), and OB-T2D (MD: 2.7 mg/L; 95% CI: 0.3, 5.1) compared with Lean-NG, whereas interleukin (IL)-2 secretion was lower in OB-T2D group (MD: -2086.4 pg/mL; 95% CI: -4375.9, -37.4). OB-T2D also exhibited higher neutrophils (MD: 0.7%; 95% CI: 0.01, 0.12), Systemic Immune-Inflammation Index (MD: 155.3; 95% CI: 0.90, 309.7), and system inflammation response index (MD: 0.58, 95% CI: 0.20, 0.97) compared with Lean-NG, and a lower proportion of naïve CD8+ T cells than OB-NG (MD: -13.7%; 95% CI: -27.3, -0.14). Regression analysis showed an association between hyperglycemia and reduced immune function, particularly for IL-2 (β = -0.296, P = 0.037) and interferon-gamma secretion (β = -0.325, P = 0.017). CONCLUSIONS: Immune function is compromised in obesity and worsens in T2D, suggesting both obesity and poor glucose control drive immune dysfunction. Addressing metabolic health may help mitigate immune dysfunction and inflammation in obesity-related conditions. TRIAL REGISTRATION NUMBER: This trial was registered at clinicaltrials.gov as NCT04291391 (https://www. CLINICALTRIALS: gov/study/NCT04291391?term=NCT04291391&rank=1).
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.008 | 0.006 |
| Meta-epidemiology (narrow) | 0.002 | 0.001 |
| Meta-epidemiology (broad) | 0.004 | 0.002 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.002 | 0.001 |
| Insufficient payload (model declined to judge) | 0.002 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".