In overweight men, high levels of the inflammatory marker TNF-α are linked to eating more food, but this effect is reduced when another inflammatory marker, IL-6, is also high.
Claim Context
In overweight men, elevated plasma TNF-α levels above 15 pg/mL are associated with increased caloric intake, but this effect is mitigated by concurrent elevation of IL-6, suggesting a complex interaction between pro-inflammatory cytokines and energy regulation.
“A TNF-α above 15 pg/mL was associated with a higher calorie intake (Figure 7C, node 2), while concentrations lower than 15 pg/mL were associated with a lower calorie intake (node 1). Node 2 is branched into nodes 3 and 4, suggesting that, in those individuals that have a higher plasma TNF-α concentration, an increased IL-6 mitigates the increase in caloric intake.”
Evidence from Studies
No evidence studies found yet.
What Would Prove This
Per GRADE and EBM methodology, here is what ideal scientific evidence would look like to definitively prove or disprove this claim, ordered from strongest to weakest.
Whether TNF-α >15 pg/mL consistently predicts higher caloric intake in overweight populations, and whether IL-6 elevation modifies this relationship across studies.
A systematic review and meta-analysis of at least 12 studies measuring TNF-α and IL-6 levels and daily caloric intake in overweight adults, with subgroup analysis by cytokine thresholds and interaction effects, using standardized assays and dietary recording methods.
Whether experimentally elevating TNF-α increases caloric intake in overweight men, and whether co-administration of IL-6 blunts this effect.
A double-blind RCT with 40 overweight men receiving intravenous TNF-α (targeting >15 pg/mL) with or without IL-6 infusion (targeting >8 pg/mL) versus placebo, measuring ad libitum food intake over 4 hours under controlled conditions.
Whether overweight men with persistently high TNF-α and variable IL-6 levels show different long-term caloric intake patterns.
A prospective cohort study following 350 overweight men for 18 months, measuring quarterly TNF-α and IL-6 levels and daily caloric intake via digital logs, analyzing interaction effects on energy balance.
Whether overweight men with high caloric intake have higher TNF-α and lower IL-6 than those with low intake.
A case-control study comparing 120 overweight men with high daily intake (>2500 kcal) to 120 with low intake (<1800 kcal), measuring fasting TNF-α and IL-6 levels, adjusting for BMI, age, and physical activity.
Whether TNF-α and IL-6 levels correlate with daily caloric intake in overweight men at a single time point.
A cross-sectional study of 600 overweight men measuring fasting TNF-α and IL-6 levels and correlating them with 24-hour dietary recall data.