Cited by 98Dietary Effects on HealthNutritional Studies and DietDiet and metabolism studies

Intermittent fasting for the prevention of cardiovascular disease

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Allaf, Mohammed, Elghazaly, Hussein, Mohamed, Omer G, Fareen, Mohamed Firas Khan, Zaman, Sadia, Salmasi, Abdul-Majeed, Tsilidis, Kostas, Dehghan, Abbas·2021·Cochrane Database of Systematic Reviews

Abstract

BACKGROUND: Cardiovascular disease (CVD) is the leading cause of death worldwide. Lifestyle changes are at the forefront of preventing the disease. This includes advice such as increasing physical activity and having a healthy balanced diet to reduce risk factors. Intermittent fasting (IF) is a popular dietary plan involving restricting caloric intake to certain days in the week such as alternate day fasting and periodic fasting, and restricting intake to a number of hours in a given day, otherwise known as time-restricted feeding. IF is being researched for its benefits and many randomised controlled trials have looked at its benefits in preventing CVD. OBJECTIVES: To determine the role of IF in preventing and reducing the risk of CVD in people with or without prior documented CVD. SEARCH METHODS: We conducted our search on 12 December 2019; we searched CENTRAL, MEDLINE and Embase. We also searched three trials registers and searched the reference lists of included papers. Systematic reviews were also viewed for additional studies. There was no language restriction applied. SELECTION CRITERIA: We included randomised controlled trials comparing IF to ad libitum feeding (eating at any time with no specific caloric restriction) or continuous energy restriction (CER). Participants had to be over the age of 18 and included those with and without cardiometabolic risk factors. Intermittent fasting was categorised into alternate-day fasting, modified alternate-day fasting, periodic fasting and time-restricted feeding. DATA COLLECTION AND ANALYSIS: Five review authors independently selected studies for inclusion and extraction. Primary outcomes included all-cause mortality, cardiovascular mortality, stroke, myocardial infarction, and heart failure. Secondary outcomes include the absolute change in body weight, and glucose. Furthermore, side effects such as headaches and changes to the quality of life were also noted. For continuous data, pooled mean differences (MD) (with 95% confidence intervals (CIs)) were calculated. We contacted trial authors to obtain missing data. We used GRADE to assess the certainty of the evidence. MAIN RESULTS: Our search yielded 39,165 records after the removal of duplicates. From this, 26 studies met our criteria, and 18 were included in the pooled analysis. The 18 studies included 1125 participants and observed outcomes ranging from four weeks to six months. No studies included data on all-cause mortality, cardiovascular mortality, stroke, myocardial infarction, and heart failure at any point during follow-up. Of quantitatively analysed data, seven studies compared IF with ab libitum feeding, eight studies compared IF with CER, and three studies compared IF with both ad libitum feeding and CER. Outcomes were reported at short term (≤ 3 months) and medium term (> 3 months to 12 months) follow-up. Body weight was reduced with IF compared to ad libitum feeding in the short term (MD -2.88 kg, 95% CI -3.96 to -1.80; 224 participants; 7 studies; low-certainty evidence). We are uncertain of the effect of IF when compared to CER in the short term (MD -0.88 kg, 95% CI -1.76 to 0.00; 719 participants; 10 studies; very low-certainty evidence) and there may be no effect in the medium term (MD -0.56 kg, 95% CI -1.68 to 0.56; 279 participants; 4 studies; low-certainty evidence). We are uncertain about the effect of IF on glucose when compared to ad libitum feeding in the short term (MD -0.03 mmol/L, 95% CI -0.26 to 0.19; 95 participants; 3 studies; very-low-certainty of evidence) and when compared to CER in the short term: MD -0.02 mmol/L, 95% CI -0.16 to 0.12; 582 participants; 9 studies; very low-certainty; medium term: MD 0.01, 95% CI -0.10 to 0.11; 279 participants; 4 studies; low-certainty evidence). The changes in body weight and glucose were not deemed to be clinically significant. Four studies reported data on side effects, with some participants complaining of mild headaches. One study reported on the quality of life using the RAND SF-36 score. There was a modest increase in the physical component summary score. AUTHORS' CONCLUSIONS: Intermittent fasting was seen to be superior to ad libitum feeding in reducing weight. However, this was not clinically significant. There was no significant clinical difference between IF and CER in improving cardiometabolic risk factors to reduce the risk of CVD. Further research is needed to understand the safety and risk-benefit analysis of IF in specific patient groups (e.g. patients with diabetes or eating disorders) as well as the effect on longer-term outcomes such as all-cause mortality and myocardial infarction.

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  • TRE demonstrates beneficial effects on cardiovascular metabolic parameters and lipid profiles.

    “Furthermore, TRE demonstrates beneficial effects on cardiovascular metabolic parameters [87, 90] and lipid profiles [76, 83, 87].”

    From Comparing caloric restriction regimens for effective weight management in adults: a systematic review and network meta-analysis (2024) · cites this paper as [83]

    The Discussion (page unavailable) reports statistically favorable changes in total cholesterol, systolic blood pressure, and other measures for intermittent fasting versus unrestricted eating. But it says none met the review’s threshold for clinical significance, and it does not establish those benefits specifically for time-restricted eating (TRE). Compared with continuous energy restriction, it reports similar effects on lipids, blood pressure, and glucose rather than a distinct TRE benefit. (LLM, conf=0.85)

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  • The STF lean mass drawback conclusion is supported by previous research.

    “a conclusion supported by previous research [80, 83]”

    From Comparing caloric restriction regimens for effective weight management in adults: a systematic review and network meta-analysis (2024) · cites this paper as [83]

    The Background reports no significant difference in lean mass between alternate-day fasting, continuous energy restriction, and unrestricted feeding in one trial. The passages found do not establish a lean-mass drawback of STF; the review’s reported results focus on body weight rather than that claim (searched: lean mass loss, fat-free mass). (LLM, conf=0.73)

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Research works printed but not linked: 4

  1. Wilhelmi de Toledo F, Grundler F, Bergouignan A, Drinda S, Michalsen A. Safety, health improvement and well-being during a 4 to 21-day fasting period in an observational study including 1422 subjects. PLOS One 2019;14(1):e0209353. [DOI] [PMC free article] [PubMed] [Google Scholar]
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Authors
Allaf, M., Elghazaly, H., Mohamed, O. G., Fareen, M. F. K., Zaman, S., Salmasi, A.-M., Tsilidis, K., & Dehghan, A.
Affiliations
  • Imperial College London (GB)
  • London North West Healthcare NHS Trust (GB)
  • Department of Epidemiology and Biostatistics, School of Public Health; Imperial College London; London UK
Venue
Cochrane Database of Systematic Reviews
Publisher
Wiley
Published
2021-01-29
Volume
2021
Issue
3
Pages
CD013496-CD013496
ISSN
  • 1361-6137 (ISSN-L)
  • 1465-1858
OpenAlex
W2991261186
Cited by
98
References
26
Citations by year
2026: 6 · 2025: 14 · 2024: 25 · 2023: 23 · 2022: 19 · 2021: 10 · 2020: 1
FWCI
2.57
Type
journal article
Language
en
Open access
Locations
  • Cochrane Database of Systematic Reviews (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Health Sciences › Medicine › Physiology › Dietary Effects on Health
  • Health Sciences › Medicine › Public Health, Environmental and Occupational Health › Nutritional Studies and Diet
  • Health Sciences › Medicine › Physiology › Diet and metabolism studies
Keywords
intermittent fasting, cardiovascular disease prevention, alternate-day fasting, time-restricted feeding, continuous energy restriction, cardiometabolic risk factors, body weight, blood glucose, cardiovascular mortality, stroke, myocardial infarction, heart failure, all-cause mortality, adverse effects, quality of life, lifestyle intervention, dietary restriction, physical activity, sleep duration, sleep quality
MeSH terms
Adult, Blood Glucose, Body Weight, Cardiovascular Diseases, Fasting, Feeding Behavior, Humans, Quality of Life, Time Factors, Bias, Randomized Controlled Trials as Topic, Caloric Restriction

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