Ramadan Fasting Reduces Inflammatory Cytokines by Up to 78% in Healthy Adults: What the Research Shows

Medical disclaimer: This article summarises published research for informational purposes only. It is not medical advice and is not a substitute for guidance from a qualified health professional. Always consult your doctor before starting any fasting protocol, especially if you have an existing health condition or take medication.

Study at a Glance

What This Study Looked At

Ramadan fasting is one of the oldest and most widely practiced forms of intermittent fasting in the world — approximately 1.8 billion Muslims observe it each year. During Ramadan, participants abstain from all food and drink during daylight hours (typically 14–16 hours), then eat during the evening and night hours.

Researchers wanted to know whether this pattern of diurnal fasting affected immune system markers and systemic inflammation. Specifically, they measured three key proinflammatory cytokines — IL-1β, IL-6, and TNF-α — alongside circulating immune cell counts, blood pressure, body weight, and body fat percentage. You can read more about how fasting affects inflammation broadly in our article on intermittent fasting and inflammation research and does intermittent fasting reduce inflammation.

Who Was Studied

Participant profile: Healthy adult volunteers, 21 men and 29 women, no major health conditions reported. All were Muslim and already planning to observe Ramadan.

How Ramadan fasting worked in this study: Participants fasted from dawn to sunset each day — typically 14–16 hours depending on season and location. No food or water during daylight hours. Eating occurred during the evening and overnight window. No calorie targets were prescribed; participants ate normally within their permitted window.

What the Researchers Found

Inflammatory Cytokines

• IL-1β dropped by 78% — from 18 to 4 pg/mL during Ramadan versus before (p < .001)
• IL-6 fell by 57% — from 155 to 67 pg/mL during versus before Ramadan (p < .001)
• TNF-α declined 66% — from 180 to 62 pg/mL during Ramadan (p < .001)
• All three cytokines returned to pre-Ramadan baseline approximately 1 month after fasting ended

Immune Cell Counts

• All immune cell categories fell significantly during Ramadan
• Critically, all cell counts remained within clinically normal reference ranges — the decreases reflected downregulation of inflammatory signalling, not immune suppression
• Cell counts returned to pre-Ramadan levels 1 month after Ramadan

Body Composition and Cardiovascular Markers

• Body weight significantly decreased during Ramadan versus before (p < .05)
• Body fat percentage significantly lower during Ramadan (p < .05)
• Systolic blood pressure significantly reduced during Ramadan (p < .05)
• Diastolic blood pressure significantly reduced during Ramadan (p < .05)

What Did Not Change

• Immune cell counts remained within healthy clinical reference ranges throughout — no immunosuppression occurred
• The pattern of immune downregulation was transient; all markers returned to baseline post-Ramadan

What the Researchers Concluded

The researchers concluded that Ramadan intermittent fasting attenuates the body's inflammatory status by suppressing proinflammatory cytokine expression and decreasing circulating levels of immune cells — while these cells remained within normal physiological ranges. The reductions in body fat and body weight were proposed as partial mechanisms for the anti-inflammatory effects, since adipose tissue is itself a source of inflammatory cytokines.

What This Means If You Fast

• Fasting may substantially reduce systemic inflammation. Reductions of 57–78% in key inflammatory cytokines are clinically meaningful. Chronic low-grade inflammation is associated with metabolic disease, cardiovascular risk, joint pain, and accelerated aging. Fasting appears to address this directly.
• The immune changes are a sign of healing, not weakness. The drop in circulating immune cells during Ramadan might sound alarming, but all counts stayed within healthy ranges. This likely reflects reduced inflammatory activation rather than immune suppression. Learn more about intermittent fasting and inflammation research.
• Effects are temporary without consistent practice. Cytokines and immune cell counts returned to pre-Ramadan levels within a month of stopping. This suggests the anti-inflammatory effects require ongoing fasting practice rather than a one-time intervention.
• Fasting may help body fat reduction, which itself reduces inflammation. Adipose tissue produces inflammatory cytokines. Fasting reduced body fat percentage alongside cytokine levels, suggesting a dual pathway — direct metabolic effects of fasting plus secondary reduction in fat-derived inflammation.
• Diurnal fasting (daylight hours) appears sufficient. Ramadan fasting is 14–16 hours of daily fasting — comparable to standard 16:8 intermittent fasting. This research suggests you don't need extended multi-day fasts to see meaningful anti-inflammatory effects. 16:8 intermittent fasting appears to produce comparable fasting windows.
• Blood pressure improved alongside inflammation. The simultaneous reduction in blood pressure alongside cytokine levels during Ramadan is consistent with findings across other intermittent fasting and blood pressure research.

Study Limitations

• No control group. All participants fasted during Ramadan. There was no randomised non-fasting comparator group. It's possible that seasonal, dietary, or behavioural changes other than fasting contributed to the findings.
• Small sample size (n=50). Larger trials are needed to confirm these findings across different populations and contexts.
• Gender distribution. 29 women vs. 21 men — the sample was not gender-balanced, and no subgroup analysis by sex was reported. Hormonal differences in immune response between men and women are well-established.
• Food intake during the eating window not controlled. Ramadan eating patterns vary widely. Participants may have changed food quality or quantity during Ramadan, which could independently affect inflammation markers.
• Single time point during Ramadan. Measurements were taken at the end of the third week. It's unknown whether the inflammatory changes peaked earlier, later, or varied through the month.
• Population specificity. Participants were Muslim adults observing Ramadan for religious reasons. Motivational and behavioural factors in this context may differ from secular IF practitioners.
• No conflict of interest statement reported.

Source

Faris, M.A., Kacimi, S., Al-Kurd, R.A., Fararjeh, M.A., Bustanji, Y.K., Mohammad, M.K., & Salem, M.L. (2012). Intermittent fasting during Ramadan attenuates proinflammatory cytokines and immune cells in healthy subjects. Nutrition Research, 32(12), 947–955. PMID: 23244540

Frequently Asked Questions

Does Ramadan fasting suppress the immune system?

No. The reduction in circulating immune cells during Ramadan in this study remained entirely within normal clinical reference ranges. The decrease more likely reflects reduced inflammatory activation — the immune system is less "on alert" because there is less inflammatory stimulus — rather than any suppression of immune defence capability.

How much does intermittent fasting reduce inflammation?

In this 50-person study, 30 days of Ramadan intermittent fasting reduced TNF-α by 66%, IL-6 by 57%, and IL-1β by 78% compared to pre-fasting levels. These are substantial reductions. Whether comparable reductions occur with 16:8 daily fasting over longer periods hasn't been directly measured in the same way, but other research consistently shows anti-inflammatory effects of IF.

Why do inflammatory markers return after Ramadan ends?

Inflammation markers returned to baseline approximately one month after Ramadan ended, when participants resumed their normal eating patterns. This indicates that the anti-inflammatory effects are dependent on continued fasting practice. For sustained anti-inflammatory benefits, consistent long-term intermittent fasting appears necessary rather than a single annual cycle.

Can fasting help with chronic inflammatory conditions?

This study examined healthy adults without diagnosed inflammatory conditions. The results suggest that fasting modulates inflammation at the molecular level, which is promising for conditions linked to chronic low-grade inflammation — but this study alone cannot support clinical claims about specific conditions. Research in arthritis, IBD, and other inflammatory conditions is emerging separately.

Does losing body fat during fasting also reduce inflammation?

The researchers in this study noted that the reductions in body fat percentage alongside cytokine reductions during Ramadan suggest a dual mechanism: fasting directly affects inflammatory cytokine production, and the concurrent reduction in adipose tissue (which secretes its own inflammatory signals) adds to the anti-inflammatory effect. Both pathways appear to be active.

Related Research and Articles

• Intermittent fasting and inflammation: the research explained
• Does intermittent fasting reduce inflammation?
• Intermittent fasting benefits: the complete science-backed guide
• What is 16:8 intermittent fasting?
• Can intermittent fasting lower blood pressure?
• Intermittent fasting and autophagy explained
• Intermittent fasting and gut health

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