Intermittent fasting UK research benefits: What UK studies show (2026)

الصيام المتقطع: أبحاث المملكة المتحدة وفوائده (2026)

Author: Feras Alayed - Therapeutic & Behavioral Nutrition Specialist

Published: July 27, 2026

Category: british-health

Reading Time: 11 minutes

Key Takeaways

UK research and NHS-funded trials show time‑restricted eating (TRE) is widely studied but usually delivers similar short-term weight loss to standard calorie restriction. ([bmj.com](https://www.bmj.com/content/389/bmj-2024-082007.full?utm_source=openai))
Early TRE (eating earlier in the day) may improve fasting insulin and modestly reduce weight in adherent participants. ([bmjmedicine.bmj.com](https://bmjmedicine.bmj.com/content/bmjmed/5/1/e001071.full.pdf?utm_source=openai))
NICE and NHS recommend individualised approaches; people on diabetes medications must seek GP advice before fasting. ([nice.org.uk](https://www.nice.org.uk/guidance/ph35/chapter/recommendations?utm_source=openai))
The NHS Diabetes Prevention Programme is the established UK route for structured prevention support across England (with equivalent services across Scotland, Wales and Northern Ireland). ([england.nhs.uk](https://www.england.nhs.uk/diabetes/diabetes-prevention/?utm_source=openai))
High‑quality meta‑analyses find intermittent fasting produces small‑to‑moderate short‑term metabolic benefits, but long‑term evidence and who benefits most remain under active study. ([pmc.ncbi.nlm.nih.gov](https://pmc.ncbi.nlm.nih.gov/articles/PMC10630127/?utm_source=openai))

TL;DR

UK trials and systematic reviews show intermittent fasting (especially time‑restricted eating) can produce modest weight loss and small improvements in metabolic markers compared with usual diet, but is generally not superior to matched calorie restriction. NICE recommends more research and NHS guidance stresses medical review for people with diabetes or on relevant medicines. ([bmj.com](https://www.bmj.com/content/389/bmj-2024-082007.full?utm_source=openai))

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Introduction

Shocking UK statistic: more than 4.6 million people in the UK now have a diagnosis of diabetes, and millions more are at raised risk — a burden that underpins the intense interest in dietary approaches such as intermittent fasting. ([diabetes.org.uk](https://www.diabetes.org.uk/about-us/news-and-views/one-five-adults-now-live-diabetes-or-prediabetes-uk?utm_source=openai))

What is intermittent fasting and time‑restricted eating?

Intermittent fasting (IF) refers to eating patterns that alternate fasting and feeding periods. Time‑restricted eating (TRE), a common form of IF, limits daily calorie intake to a consistent window (for example 8–10 hours) and fasting for the remainder of the 24‑hour day. Popular variants include 16:8 (16 hours fasting, 8 hours eating), the 5:2 approach (very low calorie two days/week) and alternate‑day fasting. TRE focuses on timing rather than food type. ([bmjopensem.bmj.com](https://bmjopensem.bmj.com/content/8/1/e001206?utm_source=openai))

Why the UK is studying intermittent fasting

Rising rates of overweight, obesity and type 2 diabetes in the UK have led researchers and NHS bodies to test pragmatic dietary strategies that might be easier to follow than daily calorie counting. NHS trusts and UK universities are running TRE trials (including studies catalogued by the Health Research Authority) to evaluate cardiometabolic outcomes. ([hra.nhs.uk](https://www.hra.nhs.uk/planning-and-improving-research/application-summaries/research-summaries/tre-study/?utm_source=openai))

Summary of the best UK and international evidence (2021–2026)

Systematic reviews and network meta‑analyses

Recent high‑quality reviews (BMJ, BMJ Medicine and Cochrane updates) synthesise randomised trials comparing IF strategies with continuous energy restriction. Overall, IF/TRE produces small to moderate weight loss versus habitual diets, and similar results when compared with calorie‑matched diets — indicating that energy restriction still explains much of the benefit. However, evidence suggests early TRE (eating earlier in the day) may give extra metabolic benefit for fasting insulin and some glucose markers. ([bmj.com](https://www.bmj.com/content/389/bmj-2024-082007.full?utm_source=openai))

Key randomised controlled trials

NEJM multicentre RCT (2022) compared TRE plus calorie guidance vs daily calorie restriction: both groups lost weight and metabolic markers (fasting glucose, lipids, blood pressure) changed similarly over 12 months. This underlines that TRE does not always outperform standard energy restriction. ([nejm.org](https://www.nejm.org/doi/full/10.1056/NEJMoa2114833?utm_source=openai))
JAMA Internal Medicine trial (early TRE) found adherent participants who ate within an early 8‑hour window (07:00–15:00) achieved modestly greater weight and insulin resistance improvements vs controls—highlighting the role of timing and adherence. Values reported used conventional units; UK clinicians convert glucose findings to mmol/L when advising patients. ([pubmed.ncbi.nlm.nih.gov](https://pubmed.ncbi.nlm.nih.gov/35939311/?dopt=Abstract&utm_source=openai))
TIMET and other TRE trials in people with metabolic syndrome show modest improvements in body weight and cardiometabolic risk factors but emphasise adherence as the major determinant of benefit. ([pubmed.ncbi.nlm.nih.gov](https://pubmed.ncbi.nlm.nih.gov/39348690/?utm_source=openai))

Cochrane and independent reviews

Cochrane and other evidence syntheses found IF may result in similar weight loss to conventional diets over the short term and called for longer follow‑up and higher‑quality RCTs to determine long‑term outcomes for diabetes incidence and cardiovascular events. The most recent Cochrane summary highlights uncertainty about long‑term benefits and harms. ([cochrane.org](https://www.cochrane.org/evidence/CD015610_intermittent-fasting-traditional-dietary-advice-or-no-treatment-which-works-better-help-adults?utm_source=openai))

What outcomes matter in UK research?

Researchers typically measure: body weight, waist circumference, fasting glucose and insulin, HbA1c, blood lipids, blood pressure, and patient‑reported outcomes (energy, sleep, mood). In the UK NICE guidance and NHS services also use HbA1c (reported in mmol/mol) and fasting plasma glucose (mmol/L) to classify risk: HbA1c 42–47 mmol/mol (6.0–6.4%) denotes non‑diabetic hyperglycaemia, and ≥48 mmol/mol (6.5%) indicates diabetes. Fasting plasma glucose 5.5–6.9 mmol/L aligns with the high‑risk category. People with values in these ranges are often eligible for referral to the Healthier You NHS Diabetes Prevention Programme. ([nice.org.uk](https://www.nice.org.uk/indicators/ind172-diabetes-ndh-annual-hb-a1c-or-fpg-test/chapter/indicator?utm_source=openai))

Practical UK guidance: who should talk to a GP first?

The NHS and Diabetes UK caution that people taking insulin, sulphonylureas, SGLT2 inhibitors or those with kidney, liver, heart disease, pregnancy or a history of severe hypoglycaemia must seek clinical advice before trying IF. The Diabetes UK and NHS resources emphasise medication adjustment, blood glucose monitoring and individualised planning. If symptoms such as faintness, confusion or recurrent low glucose occur, people should contact their GP or attend A&E as appropriate. ([diabetes.org.uk](https://www.diabetes.org.uk/living-with-diabetes/eating/fasting?utm_source=openai))

How TRE may affect blood glucose (UK units)

Trials report fasting glucose improvements that translate into modest falls in fasting plasma glucose (for example moving from 6.1 mmol/L towards the 5–5.5 mmol/L range in some adherent groups). Early TRE has been associated with reductions in fasting insulin and improvements in insulin resistance indices. However, results are variable — many benefits are driven by overall calorie reduction and weight loss rather than timing alone. Always interpret individual glucose values (mmol/L) with your clinician. ([pubmed.ncbi.nlm.nih.gov](https://pubmed.ncbi.nlm.nih.gov/35939311/?dopt=Abstract&utm_source=openai))

Comparison table: common IF approaches (practical UK view)

Approach	Typical pattern	Evidence summary	Who in the UK might try it (with advice)
Time‑restricted eating (TRE, e.g., 16:8)	Daily 8‑10h eating window	Modest weight loss; early TRE may lower fasting insulin. Similar to calorie restriction when energy intake is matched. ([bmj.com](https://www.bmj.com/content/389/bmj-2024-082007.full?utm_source=openai))	Adults without glucose‑lowering medications; with GP sign‑off if high risk.
5:2 (2 low‑calorie days/week)	Very low calories on 2 days, normal eating other days	Produces weight loss similar to other IF forms and to continuous restriction in multiple trials. ([bmj.com](https://www.bmj.com/content/389/bmj-2024-082007.short?utm_source=openai))	Adults seeking structured weekly plan; medical review if comorbidities.
Alternate day fasting	Fast day / feast day alternation	Less well tolerated long‑term; weight loss observed but adherence varies. ([bmj.com](https://www.bmj.com/content/389/bmj-2024-082007.short?utm_source=openai))	Not recommended without supervision in older adults or those on medications.

How the NHS and NICE approach intermittent fasting

NICE has highlighted the need for more research into intermittent fasting and has recommended individualised weight‑management packages and further studies comparing IF to standard care. The NHS recommends referral to structured services such as the Healthier You NHS Diabetes Prevention Programme for people at high risk of type 2 diabetes; these are available across England (with local equivalent programmes and services delivered across Scotland, Wales and Northern Ireland). UK clinicians increasingly use TRE as one option among many behavioural tools. ([nice.org.uk](https://www.nice.org.uk/guidance/gid-ng10182/documents/draft-guideline-2?utm_source=openai))

Who benefits most (current understanding)?

Evidence suggests that people who are able to adhere consistently (for example ≥5 days/week early TRE) see greater improvements in weight and insulin resistance. Age, occupation (shift work), medication use, social factors and sleep patterns influence suitability and outcomes. Meta‑analyses show population‑level effects are modest and that personal preference and adherence often determine success. ([pubmed.ncbi.nlm.nih.gov](https://pubmed.ncbi.nlm.nih.gov/36518092/?utm_source=openai))

Risks, practical tips and safety (UK clinical context)

Medication safety: people on insulin, sulphonylureas or SGLT2 inhibitors must not fast without medical review — hypoglycaemia or dehydration risk may rise. Contact your GP or diabetes specialist nurse for a medication plan. ([diabetes.org.uk](https://www.diabetes.org.uk/living-with-diabetes/eating/fasting?utm_source=openai))
Hydration and caffeine: keep fluids available; plain water, black tea or coffee (without sugar) are acceptable during fasting windows in most TRE trials. ([hra.nhs.uk](https://www.hra.nhs.uk/planning-and-improving-research/application-summaries/research-summaries/investigating-the-effect-of-time-restricted-eating-on-sperm-quality/?utm_source=openai))
Work and sleep: schedule eating windows that fit your circadian rhythm (early TRE aligns with daytime biological rhythms and may offer advantages). Night shift workers need personalised plans. ([bmjmedicine.bmj.com](https://bmjmedicine.bmj.com/content/bmjmed/5/1/e001071.full.pdf?utm_source=openai))
Pregnancy and underweight: avoid IF in pregnancy, breastfeeding, eating disorders, or in people underweight — seek NHS advice. ([england.nhs.uk](https://www.england.nhs.uk/diabetes/diabetes-prevention/?utm_source=openai))

How ‘Feel Great’ fits in (behavioural nutrition & metabolic health)

For people exploring lifestyle approaches, the Feel Great system is offered as a non‑medical, lifestyle support package that may help individuals combine timing strategies with nutrient design and behavioural tools. Its features include a soluble fibre matrix (Balance) designed to moderate post‑meal glucose responses, a yerba mate extract (Unimate) containing chlorogenic acids for alertness and mental clarity, and the 4‑4‑12 intermittent fasting protocol as a structured, user‑facing timing plan. Clinical studies referenced in the product PDR (50+ entries) are used to support educational claims; Feel Great is not a medication but an adjunctive lifestyle system that may support metabolic health behaviours such as improved glucose handling, appetite control and adherence to a TRE routine. Anyone with diabetes or on glucose‑lowering medicines should consult their GP or diabetes specialist nurse before using Feel Great alongside fasting.

FAQ

Q: What fasting blood glucose (mmol/L) should make me seek help? A: Fasting venous plasma glucose ≥7.0 mmol/L or an HbA1c ≥48 mmol/mol indicates diabetes and warrants GP review; values in the pre‑diabetes range (fasting 5.5–6.9 mmol/L or HbA1c 42–47 mmol/mol) should prompt annual monitoring and consideration of NHS prevention programmes. ([nice.org.uk](https://www.nice.org.uk/guidance/ph35/chapter/recommendations?utm_source=openai))
Q: Will intermittent fasting cause muscle loss? A: When combined with adequate protein and resistance activity, short‑term TRE trials do not show major lean‑mass losses in most adults, but older adults should seek guidance and may need protein timing strategies. UK TRE research includes trials focusing on protein and older participants. ([hra.nhs.uk](https://www.hra.nhs.uk/planning-and-improving-research/application-summaries/research-summaries/time-restricted-eating-tre-and-protein-in-older-adults/?utm_source=openai))
Q: How quickly will I see changes in mmol/L glucose? A: Some people see fasting glucose and insulin changes within weeks, often alongside weight loss; results vary widely and require monitoring in primary care. ([pubmed.ncbi.nlm.nih.gov](https://pubmed.ncbi.nlm.nih.gov/35939311/?dopt=Abstract&utm_source=openai))
Q: Can I use continuous glucose monitoring (CGM) to test TRE? A: CGM has been used in research to show post‑meal glucose patterns; discuss with your clinician whether CGM is appropriate for monitoring. UK research frequently uses CGM in TRE trials. ([pubmed.ncbi.nlm.nih.gov](https://pubmed.ncbi.nlm.nih.gov/39348690/?utm_source=openai))
Q: Is intermittent fasting recommended by UK public health? A: Public bodies (NICE, NHS) do not mandate one diet; they recommend evidence‑based, individualised weight management and have called for further IF research while supporting structured prevention programmes. ([nice.org.uk](https://www.nice.org.uk/guidance/ph35/chapter/recommendations?utm_source=openai))

References & Scientific Sources

NHS England — Healthier You: NHS Diabetes Prevention Programme (overview and delivery across England). ([england.nhs.uk](https://www.england.nhs.uk/diabetes/diabetes-prevention/?utm_source=openai))
Diabetes UK — Intermittent fasting information and diabetes guidance. ([diabetes.org.uk](https://www.diabetes.org.uk/about-diabetes/type-2-diabetes/remission/intermittent-fasting-for-remission?utm_source=openai))
NICE — Type 2 diabetes prevention guidance and diagnostic thresholds (HbA1c and fasting glucose in mmol/mol and mmol/L). ([nice.org.uk](https://www.nice.org.uk/guidance/ph35/chapter/recommendations?utm_source=openai))
British Heart Foundation — Expert commentary on intermittent fasting coverage and research interpretation. ([bhf.org.uk](https://www.bhf.org.uk/informationsupport/heart-matters-magazine/news/behind-the-headlines/intermittent-fasting?utm_source=openai))
NEJM 2022 — Calorie restriction with or without time‑restricted eating randomized trial. ([nejm.org](https://www.nejm.org/doi/full/10.1056/NEJMoa2114833?utm_source=openai))
JAMA Internal Medicine 2022 — Early time‑restricted eating RCT (impact on weight and insulin). ([pubmed.ncbi.nlm.nih.gov](https://pubmed.ncbi.nlm.nih.gov/35939311/?dopt=Abstract&utm_source=openai))
BMJ 2024 — Network meta‑analysis of intermittent fasting strategies vs continuous energy restriction. ([bmj.com](https://www.bmj.com/content/389/bmj-2024-082007.full?utm_source=openai))
BMJ Medicine 2026 — Systematic review on timing and eating duration effects on metabolic outcomes. ([bmjmedicine.bmj.com](https://bmjmedicine.bmj.com/content/5/1/e001071?utm_source=openai))
Cochrane evidence summary — Intermittent fasting vs traditional dietary advice (evidence synthesis and recommendations for further research). ([cochrane.org](https://www.cochrane.org/evidence/CD015610_intermittent-fasting-traditional-dietary-advice-or-no-treatment-which-works-better-help-adults?utm_source=openai))
Selected UK trial listings and HRA summaries — TRE study and UK trial portfolio (Health Research Authority). ([hra.nhs.uk](https://www.hra.nhs.uk/planning-and-improving-research/application-summaries/research-summaries/tre-study/?utm_source=openai))

Medical Disclaimer: This article is informational and not a substitute for medical advice. If you have diabetes, take medications that affect blood glucose, are pregnant, breastfeeding, or have chronic medical conditions, consult your GP, diabetes specialist or NHS service before starting intermittent fasting. Attend A&E for acute symptoms such as fainting, confusion or severe hypoglycaemia. The Feel Great system is a lifestyle support product and is not a medicine. ([diabetes.org.uk](https://www.diabetes.org.uk/living-with-diabetes/eating/fasting?utm_source=openai))

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أهم النقاط

تظهر أبحاث المملكة المتحدة وبرامج ممولة من NHS أن تقييد تناول الطعام زمنياً (TRE) خُضعت للبحث على نطاق واسع وتعطي فقدان وزن متواضعاً مماثلاً غالباً للحد من السعرات الحرارية. ([bmj.com](https://www.bmj.com/content/389/bmj-2024-082007.full?utm_source=openai))
قد يُحسّن التقييد المبكر للنافذة الزمنية (الأكل في وقت مبكر من اليوم) مقاومة الإنسولين لدى الملتزمين. ([bmjmedicine.bmj.com](https://bmjmedicine.bmj.com/content/bmjmed/5/1/e001071.full.pdf?utm_source=openai))
توصى NICE وNHS بتحديد الخطة حسب الحالة الفردية؛ يجب استشارة الطبيب العام إذا كنت تتناول أدوية سكر. ([nice.org.uk](https://www.nice.org.uk/guidance/ph35/chapter/recommendations?utm_source=openai))
برنامج NHS للوقاية من داء السكري (Healthier You) هو المسار المُنظم في إنجلترا، مع خدمات متكافئة في اسكتلندا وويلز وأيرلندا الشمالية. ([england.nhs.uk](https://www.england.nhs.uk/diabetes/diabetes-prevention/?utm_source=openai))
المراجعات المنهجية تشير إلى فوائد قصيرة‑المدى متواضعة، لكن الأدلة طويلة‑المدى لا تزال قيد البحث. ([pmc.ncbi.nlm.nih.gov](https://pmc.ncbi.nlm.nih.gov/articles/PMC10630127/?utm_source=openai))

الملخّص السريع

أبحاث المملكة المتحدة والدولية تُظهر أن الصيام المتقطع/TRE قد يساهم في فقدان وزن متواضع وتحسينات أيضية طفيفة، لكنه عادةً لا يتفوق على تخفيض السعرات المتكافئ؛ يجب للأشخاص الذين يستخدمون أدوية خافضة للسكر الرجوع إلى GP أو فريق السكري في NHS قبل التطبيق. ([bmj.com](https://www.bmj.com/content/389/bmj-2024-082007.full?utm_source=openai))

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مقدمة

إحصائية صادمة للمملكة المتحدة: هناك أكثر من 4.6 مليون شخص في المملكة المتحدة لديهم تشخيص بالسكري، وملايين آخرون معرضون لخطر متزايد — وهذا ما يفسر الاهتمام الكبير بأساليب التغذية مثل الصيام المتقطع. ([diabetes.org.uk](https://www.diabetes.org.uk/about-us/news-and-views/one-five-adults-now-live-diabetes-or-prediabetes-uk?utm_source=openai))

ما هو الصيام المتقطع وتقييد وقت الأكل؟

الصيام المتقطع مجموعة من أنماط الأكل التي تتناوب بين فترات صيام وتغذية. تقييد وقت الأكل (TRE) يحد نافذة الأكل اليومية (مثلاً 8–10 ساعات) بينما يُمتنع عن السعرات الباقية. من أشهر الأنماط: 16:8 و5:2 والصيام يوم بعد يوم. TRE يركّز على التوقيت أكثر من المحتوى الغذائي. ([bmjopensem.bmj.com](https://bmjopensem.bmj.com/content/8/1/e001206?utm_source=openai))

لماذا تدرس المملكة المتحدة هذا التدخل؟

ارتفاع معدلات الوزن الزائد والسكري من النوع 2 دفع الجامعات ووحدات NHS لعمل تجارب TRE عملية لتقييم آثارها على مؤشرات القلب والسكري. سجلت Health Research Authority عدة دراسات TRE التي تُجرى داخل NHS. ([hra.nhs.uk](https://www.hra.nhs.uk/planning-and-improving-research/application-summaries/research-summaries/tre-study/?utm_source=openai))

أهم الأدلة (2021–2026)

المراجعات المنهجية والشبكية (BMJ، BMJ Medicine) تجمع تجارب عشوائية وتُظهر أن IF/TRE يؤديان لفقدان وزن صغير إلى متوسط مقارنة بالحمية الاعتيادية، ولكن عند مطابقة السعرات تكون النتائج متقاربة — مما يشير إلى أن خفض الطاقة هو المحرك الرئيس. ومع ذلك، TRE المبكر قد يحسّن الإنسولين الصائم لدى الملتزمين. ([bmj.com](https://www.bmj.com/content/389/bmj-2024-082007.full?utm_source=openai))

ماذا تعني القيم المقلقة حسب NICE وNHS؟

NICE يحدد HbA1c بين 42–47 mmol/mol (6.0–6.4%) كنطاق لفرط سكر الدم غير السكري (pre‑diabetes)، و≥48 mmol/mol (6.5%) كمؤشر تشخيصي للسكري؛ صيام بلازما ≥7.0 mmol/L يُعد أيضاً ضمن عتبات التشخيص. الأشخاص بقيم HbA1c 42–47 mmol/mol قد يكونون مؤهلين لبرنامج Healthier You للوقاية عبر NHS. ([nice.org.uk](https://www.nice.org.uk/indicators/ind172-diabetes-ndh-annual-hb-a1c-or-fpg-test/chapter/indicator?utm_source=openai))

السلامة والنصائح العملية (السياق البريطاني)

استشر GP أو فريق السكري إذا كنت تتناول إنسولين أو سولفونيل يوريا أو مثبطات SGLT2 — خطر الهبوط في سكر الدم أو الجفاف. ([diabetes.org.uk](https://www.diabetes.org.uk/living-with-diabetes/eating/fasting?utm_source=openai))
الماء والشاي/القهوة السوداء مقبولة أثناء فترات الصيام في معظم التجارب؛ تجنّب السكريات السائلة. ([hra.nhs.uk](https://www.hra.nhs.uk/planning-and-improving-research/application-summaries/research-summaries/investigating-the-effect-of-time-restricted-eating-on-sperm-quality/?utm_source=openai))
تكييف نافذة الأكل مع العمل والنوم أمر مهم — TRE المبكر يتوافق أفضل مع الإيقاع اليومي البيولوجي. ([bmjmedicine.bmj.com](https://bmjmedicine.bmj.com/content/bmjmed/5/1/e001071.full.pdf?utm_source=openai))
لا يُنصح الصيام للحوامل، المرضعات أو الأشخاص الذين لديهم اضطراب أكل أو ناس تحت الوزن؛ راجع خدمات NHS للمشورة. ([england.nhs.uk](https://www.england.nhs.uk/diabetes/diabetes-prevention/?utm_source=openai))

دور Feel Great

نظام Feel Great مصمم كسلسلة دعم نمط حياة (ليس دواءً) وقد يساعد الأشخاص الذين يطبقون TRE عبر أدوات غذائية وسلوكية: Balance (مصفوفة ألياف قابلة للذوبان) التي قد تساعد في تقليل ارتفاع السكر بعد الوجبة، Unimate (مستخلص يربا ماتي) لليقظة العقلية، وبروتوكول 4‑4‑12 لتقديم هيكل تشغيلي لنافذة الأكل. يجب على من لديهم سكري أو أدوية سكر الرجوع إلى GP قبل الدمج.

خاتمة سريعة

الصيام المتقطع وTRE من الخيارات العملية التي تظهر فائدة متواضعة في التجارب الحديثة؛ ومع ذلك، ليس هناك بديل واحد مناسب للجميع. في المملكة المتحدة، توجيه NHS وNICE يركّزان على المقاربة الآمنة والشخصية، وإحالة الأشخاص المعرضين للخطر إلى برنامج Healthier You. القرار يعتمد على الأهداف الشخصية، الأدوية والحالة الصحية، والتزامك العملي بالروتين. ([england.nhs.uk](https://www.england.nhs.uk/diabetes/diabetes-prevention/?utm_source=openai))

المراجع العلمية المختارة

NHS England — Healthier You: NHS Diabetes Prevention Programme. ([england.nhs.uk](https://www.england.nhs.uk/diabetes/diabetes-prevention/?utm_source=openai))
Diabetes UK — Guidance on fasting and intermittent fasting for people with diabetes. ([diabetes.org.uk](https://www.diabetes.org.uk/about-diabetes/type-2-diabetes/remission/intermittent-fasting-for-remission?utm_source=openai))
NICE — Type 2 diabetes prevention and diagnostic thresholds (HbA1c and fasting glucose). ([nice.org.uk](https://www.nice.org.uk/guidance/ph35/chapter/recommendations?utm_source=openai))
NEJM 2022 — Calorie restriction with or without time‑restricted eating RCT. ([nejm.org](https://www.nejm.org/doi/full/10.1056/NEJMoa2114833?utm_source=openai))
JAMA Internal Medicine 2022 — Early TRE randomized clinical trial. ([pubmed.ncbi.nlm.nih.gov](https://pubmed.ncbi.nlm.nih.gov/35939311/?dopt=Abstract&utm_source=openai))
BMJ 2024 — Network meta‑analysis of intermittent fasting strategies. ([bmj.com](https://www.bmj.com/content/389/bmj-2024-082007.full?utm_source=openai))
BMJ Medicine 2026 — Systematic review on timing and eating duration. ([bmjmedicine.bmj.com](https://bmjmedicine.bmj.com/content/5/1/e001071?utm_source=openai))
Cochrane evidence summary on intermittent fasting vs traditional advice. ([cochrane.org](https://www.cochrane.org/evidence/CD015610_intermittent-fasting-traditional-dietary-advice-or-no-treatment-which-works-better-help-adults?utm_source=openai))

تنويه طبي: هذا المحتوى لأغراض المعلومات العامة فقط ولا يغني عن استشارة طبية. إذا كنت تتناول أدوية خافضة للسكر أو لديك حالة طبية مزمنة، استشر GP أو فريق السكري في NHS قبل البدء في أي نظام صيام. Feel Great هو نظام دعم نمطي وليس دواءً. ([diabetes.org.uk](https://www.diabetes.org.uk/living-with-diabetes/eating/fasting?utm_source=openai))

🇬🇧 هل أنت مستعد لبدء تحولك الصحي؟

انضم لآلاف الأشخاص في بريطانيا الذين حسّنوا صحتهم الأيضية مع نظام Feel Great. مدعوم بأكثر من 50 دراسة سريرية.

🛒 اطلب Feel Great الآن 💬 تحدث مع مدرب صحي 📋 تقييم صحي مجاني

Frequently Asked Questions

Is intermittent fasting safe for people with diabetes?

People with diabetes—especially those on insulin, sulphonylureas or SGLT2 inhibitors—should consult their GP or diabetes specialist nurse before starting intermittent fasting because medication adjustments and monitoring may be needed. ([diabetes.org.uk](https://www.diabetes.org.uk/living-with-diabetes/eating/fasting?utm_source=openai))

Does time‑restricted eating improve blood glucose (mmol/L)?

Some trials report modest reductions in fasting glucose and fasting insulin when participants adhere to TRE, but results vary and many benefits are mediated by weight loss; monitor values in mmol/L with your clinician. ([pubmed.ncbi.nlm.nih.gov](https://pubmed.ncbi.nlm.nih.gov/35939311/?dopt=Abstract&utm_source=openai))

Which is better: TRE or continuous calorie restriction?

High‑quality RCTs and meta‑analyses generally find TRE produces similar weight loss to matched calorie restriction; adherence and personal preference usually determine which is best for an individual. ([nejm.org](https://www.nejm.org/doi/full/10.1056/NEJMoa2114833?utm_source=openai))

Can I join the NHS Diabetes Prevention Programme while trying IF?

Yes. The Healthier You NHS Diabetes Prevention Programme offers structured lifestyle support across England (and similar services are available in Scotland, Wales and Northern Ireland); discuss your plans with programme staff and your GP. ([england.nhs.uk](https://www.england.nhs.uk/diabetes/diabetes-prevention/?utm_source=openai))

Will intermittent fasting reduce my HbA1c to normal?

Some people may see modest HbA1c reductions alongside weight loss, but changes are individual. Regular monitoring (HbA1c reported in mmol/mol in the UK) is recommended and clinical decisions should be made with your GP. ([pmc.ncbi.nlm.nih.gov](https://pmc.ncbi.nlm.nih.gov/articles/PMC10630127/?utm_source=openai))