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Hedi Raizer

Journal 6 min read

What is intermittent fasting?

Intermittent fasting is an eating pattern that cycles between periods of fasting and eating. This page outlines the formal definitions, synonyms, and the research studies that investigate its effects on metabolism, infla

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What is intermittent fasting?

Intermittent fasting (IF) is an umbrella term for eating patterns that alternate between voluntary fasting and non-fasting periods. Common synonyms include time-restricted feeding (TRF), time-restricted eating (TRE), alternate-day fasting (ADF), and Ramadan dry fasting. IF is not a compound with a chemical formula or molecular weight; it is a behavioral intervention defined by the timing and duration of food and fluid intake. In research settings, IF protocols are often specified by their daily fasting window, such as 16:8 (16 hours fasting, 8 hours eating) or 12:12, or by alternating days of fasting and feasting. The evidence block for this page does not provide a sequence, formula, or identifier for IF as a substance.

The research on intermittent fasting centers on metabolic and cellular pathways, including insulin sensitivity, mitochondrial function (mitophagy), inflammatory signaling, and gut–endocrine axes. Studies in this area often compare IF to standard diets or other interventions, and some investigate specific populations such as patients with pancreatitis, prostate cancer, or obesity.

Research Studies

Intermittent fasting and pancreatitis quality of life

A clinical trial is comparing intermittent fasting with a standard diet approach for improving quality of life related to pancreas disease. The study aims to improve symptoms and prevent hospitalizations for pancreas-related issues [1]. This research is ongoing and does not yet provide outcome data.

Mitophagy and mitochondrial DNA dynamics during Ramadan dry fasting vs 16:8 time-restricted feeding

A study is investigating how different types of fasting affect cell health, specifically focusing on how mitochondria are cleared and renewed. While standard intermittent fasting allows water intake, Ramadan dry fasting involves total restriction of both food and fluids from dawn to sunset. Researchers want to see if the combined effects of fluid restriction and natural daily body rhythms during Ramadan trigger a stronger cellular cleanup process (called mitophagy) compared to standard 16:8 water-permitted fasting. The study will look at how these fasting habits change blood markers related to mitochondrial DNA and metabolic health across a 30-day period [2].

Intermittent fasting and metabolic phenotyping in type 2 diabetes

A study is testing a new tool called the Snouda Metabolic Score (SMS) that helps doctors identify the specific metabolic problems driving Type 2 Diabetes in each individual patient. Instead of treating all diabetic patients the same way, the SMS classifies patients into one of several metabolic phenotypes—patterns of dysfunction across five body systems: insulin resistance, chronic inflammation, hormonal disruption, gut microbiome imbalance, and mitochondrial dysfunction. Once classified, each participant follows a personalized 24-week lifestyle and nutritional protocol targeting their specific phenotype. The protocol includes dietary changes, structured exercise, and targeted nutritional supplements [3]. Intermittent fasting is not explicitly mentioned as part of this protocol in the evidence provided.

Time-restricted eating and GLP1 receptor agonists in prostate cancer patients

A phase II trial compares the effect of time-restricted eating (TRE) and glucagon-like peptide-1 (GLP1) receptor agonists (semaglutide and tirzepatide) to an American Heart Association (AHA) heart healthy diet (HHD) intervention on cardiovascular and metabolic health in prostate cancer patients undergoing androgen deprivation therapy (ADT). Prostate cancer patients receiving hormonal therapy are at an increased risk of cardiovascular disease, thought to be due to treatment-related metabolic changes which may result in increased weight, body fat, insulin resistance, and increased risk [4].

Probiotic intervention and weight cycling

A study is evaluating the potential of probiotics in obesity management, specifically their impact on weight regain after weight loss. Obesity is a complex chronic disease closely linked to comorbidities such as cardiovascular disease, hypertension, and diabetes. Current treatments focus on weight loss through dietary control and exercise, but weight regain is common due to metabolic adaptations (e.g., post-caloric restriction). Gut microbiota play a critical role in weight management, and probiotics may reduce weight regain by modulating appetite and metabolism. Studies suggest probiotics enhance satiety and reduce appetite [5]. Intermittent fasting is not the focus of this study.

Intermittent fasting vs frequent feeding for weight loss in obese women

A study was conducted to compare the effects of a 12-week 16:8 Time-Restricted Feeding (Intermittent Fasting) + home-based exercise protocol with a calorie-restricted Standard Diet (SD) + home-based exercise protocol on body composition, lipid profile, glycemic control, and liver function enzyme levels in obese women [6].

Monitoring intermittent fasting using wearable technology

A prospective N-of-1 study aims to investigate the effects of a human optimization program on an individual's metabolic health and overall well-being. There is growing interest in personalized health strategies, including diet, exercise, and fasting regimens, to enhance metabolic fitness. Recent research indicates that intermittent fasting (IF) is useful not only for weight management, but also for energy production and improvement of metabolic well-being. IF can potentially reduce systemic inflammation and help to prevent chronic diseases. IF research can also help athletes sustain performance during fasting periods. This research examines the correlations between continuous glucose monitoring and other metrics [7].

Keto diet and intermittent fasting: oral health and salivary inflammatory biomarkers

A study aims to investigate the impact of short-term, two distinct dietary interventions—the Keto diet and Intermittent Fasting—on oral health by measuring the severity of periodontal diseases (gingivitis) and oral health status (plaque index), as well as measuring the impact of these different dietary patterns on the levels of C-reactive protein, IL-6, TNF-α, and LL-37 peptide, and measuring salivary flow and pH. The objectives include evaluating the impact of these diets on oral health among the Iraqi population and assessing changes in inflammatory biomarkers within the study groups before and after the intervention [8].

Alternate-day fasting and leptin sensitivity

Preclinical research in animal models has explored how alternate-day fasting enhances leptin sensitivity via JMJD3-dependent epigenetic regulation of the leptin receptor in the hypothalamus. Leptin resistance is a hallmark of obesity, characterized by diminished responsiveness to leptin, which disrupts energy homeostasis. Transcriptional repression of the leptin receptor (LepRb) is a critical defect that impairs downstream signal transduction [9]. This finding is from animal studies and has not been confirmed in humans.

Intermittent fasting and gut–endocrine axis in obese rats

In obese rats, intermittent fasting has been shown to amplify gut–endocrine axis responses to Senna alexandrina supplementation. Obesity induced by high-fat, high-sucrose diets disrupts lipid metabolism, glucose homeostasis, and gut microbial balance. These disturbances underscore the need for safe interventions capable of restoring metabolic regulation. Senna alexandrina, traditionally used for other purposes, was investigated in combination with intermittent fasting [10]. This is an animal study; results may not translate to humans.

If you are reading this for personal health reasons

The materials and interventions described on this page are for laboratory research purposes only. We do not provide dosing, medical guidance, or health advice. Anyone considering intermittent fasting or any related intervention for themselves should consult a licensed clinician.

Sources

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