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Muslims do not fast Ramadan for their health. We fast because Allah commanded it, and the reward we are after is forgiveness, not a smaller waist. But Allah does not ask us to do things that harm us, and over the last twenty years researchers have looked closely at what thirty days of dawn-to-sunset fasting does to the body. The results are more encouraging than most of us expected, with some honest caveats. Here are the health benefits of Ramadan as the studies describe them, and the handful of habits that quietly cancel them out.
A quick note before the science. This is general information, not medical advice. If you have diabetes, a heart condition, kidney disease, or you are pregnant or breastfeeding, talk to a doctor who understands fasting before the month starts. The Quran excuses the sick from fasting for a reason.
How Ramadan fasting is different from intermittent fasting
Intermittent fasting has become one of the most studied eating patterns in nutrition science, and Ramadan is essentially a month-long, community-wide version of it. The window is time-restricted: no food or water from Fajr to Maghrib, which is anywhere from 11 to 18 hours depending on where you live and the season.
Two things make it different from the 16:8 plan your coworker follows. Ramadan is a dry fast; no water during the day, which is rare in research settings. And the eating window falls at night, when the body is normally winding down. Those differences matter for interpreting the results, and researchers now treat “Ramadan intermittent fasting” as its own category.
1. Weight and body fat
This is the most studied outcome. A 2021 systematic review and meta-analysis in Frontiers in Nutrition pooled 66 studies on Ramadan and non-Ramadan intermittent fasting. It found a small but statistically significant reduction in body weight over the month in people who fasted compared to those who did not, with fat mass falling and fat-free mass (muscle) largely preserved.
The weight loss is modest, typically one to two kilograms over the month in most individual studies, and it depends heavily on what happens at iftar. People who eat a normal evening meal lose weight. People who eat a feast every night, followed by dessert after Taraweeh, do not. The review also noted that the changes tend to reverse within weeks of Eid unless eating habits change too, which is a polite way of saying the benefit is real but not automatic.
2. Blood pressure and heart health
A 2024 umbrella review in Nutrition Reviews, which gathered 11 separate meta-analyses, found that Ramadan fasting was associated with improvements across most components of metabolic syndrome: lower blood pressure, smaller waist circumference, lower fasting glucose, lower LDL (“bad”) cholesterol and higher HDL (“good”) cholesterol.
For blood pressure specifically, several studies show small reductions in both systolic and diastolic readings by the end of the month, likely from a combination of reduced calorie intake, less salt and processed food, and lower stress for people who slow their pace in Ramadan. People on blood pressure medication should ask their doctor about timing doses around the fast rather than skipping them.
3. Cholesterol and the lipid profile
The lipid pattern across studies is consistent: total cholesterol and LDL tend to drop, triglycerides tend to drop, and HDL tends to rise. The effect is strongest in people who were overweight going in and in those whose iftar leans on whole foods rather than fried samosas.
This is the benefit most easily destroyed. A daily plate of deep-fried pakoras and a litre of sugary drink will push triglycerides up, not down. Keep the fried food to one or two nights a week and you keep the benefit.
4. Blood sugar and insulin resistance
For people without diabetes, fasting glucose and markers of insulin resistance generally improve over Ramadan. Long gaps between meals give insulin levels time to fall, which improves the body’s sensitivity to it. Some studies have reported better HbA1c in people with well-controlled type 2 diabetes who fasted under medical supervision.
For people with diabetes, this is where the caveat is most important. Fasting can cause hypoglycaemia (dangerously low blood sugar) or, in people who overeat at night, hyperglycaemia. Anyone with diabetes should plan Ramadan with their doctor, who may adjust medication timing and doses. Many Muslim-majority countries publish Ramadan diabetes guidelines for exactly this reason.
5. The digestive system
Thirty days of giving your digestive system a long daily break can reduce bloating, acid reflux and general gut discomfort for many people, provided iftar is not a race. The common complaints in Ramadan, constipation and heartburn, almost always come from eating too fast, too much, and too little fibre at night, plus not drinking enough water between Maghrib and Fajr. Dates, fruit, vegetables, red lentils and plenty of water between sunset and dawn fix most of it.
6. The brain
One of the more interesting lines of research is on brain-derived neurotrophic factor (BDNF), a protein that supports the growth and survival of brain cells. Fasting in general has been shown to raise BDNF in animal and some human studies, and a few small Ramadan studies have reported increases in BDNF by the end of the month. The research here is early and the studies are small, so treat it as promising rather than proven. What many fasting people report is sharper focus in the afternoon once the body adapts, usually by the end of the first week.
7. The immune system and inflammation
Several studies have found reductions in inflammatory markers such as C-reactive protein and certain pro-inflammatory cytokines during Ramadan. Lower chronic inflammation is linked to lower risk of heart disease and other long-term conditions. Fasting also appears to encourage autophagy, the cellular process that clears out damaged components, which is one of the reasons fasting researchers are interested in it for long-term health.
8. Mental health and discipline
Ramadan is a structured month: fixed meal times, extra prayer, less screen time for many people, more community. Studies on mental health in Ramadan have found reductions in reported stress and anxiety in some groups, though sleep disruption can work the other way (more on that below). The spiritual side, which the studies cannot measure, is what most Muslims would point to first. A month of deliberate self-restraint, daily remembrance of Allah and nightly prayer does something for a person’s sense of peace that no blood test captures. For the duas that help with a restless mind, see our duas for anxiety and stress.
9. A reset of habits
For smokers, Ramadan is the most successful quit attempt many will ever make, because the daytime abstinence is already happening. For people who live on coffee, sugary drinks and snacking, a month without them during the day rewires the routine. The health benefit of Ramadan that lasts longest is often not physiological at all. It is that you prove to yourself you can go without.
What cancels the benefits
The studies that show no improvement, or worse numbers, have the same patterns behind them. Avoid these and you keep what the fast gives you.
- Overeating at iftar. Breaking the fast with dates and water, praying Maghrib, then eating a normal plate is the Sunnah and the science. Eating until you cannot move undoes the day.
- Fried and sugary food every night. One or two nights a week is a treat. Every night is a lipid problem.
- Sugary drinks. Juice, soda and sweetened Rooh Afza by the jug are the fastest way to gain weight in Ramadan. Water is the default; a big insulated water bottle beside you after Taraweeh makes the eight glasses happen.
- Skipping suhoor. The pre-dawn meal is Sunnah, and it is also what stops you from overeating at night. Slow carbohydrates, protein and fluids; a week of overnight oats in jars made on Sunday removes the excuse.
- Sleep deprivation. Taraweeh, late iftar, early suhoor. Many people lose two hours of sleep a night for a month, which raises stress hormones and appetite. A short nap in the afternoon, if you can get one, is the traditional fix.
- No movement at all. Light activity, a walk after Taraweeh or before iftar, protects muscle and mood. Hard training is best kept for after iftar.
For a full week of meals built around these rules, see our healthy Ramadan meal plan, and for iftar ideas that are not fried, our Ramadan iftar recipes.
Who should not fast
Islam excuses the sick, the traveller, pregnant and breastfeeding women if fasting would harm them, menstruating women, children, and the elderly and chronically ill who cannot manage it. The research backs this up. Fasting while pregnant is associated with risks the studies are still measuring, and most scholars and doctors agree a pregnant woman who is concerned should not fast and should make the days up later or pay fidya. People with type 1 diabetes, those on insulin, kidney patients and anyone with a history of eating disorders need a specific plan from their doctor, and in many cases the answer will be not to fast.
Not fasting on medical grounds is obedience to the same Quran that commands fasting. Verse 2:185 says Allah “intends for you ease and does not intend for you hardship.”
Making the most of the month
Keep iftar simple and the Sunnah way: dates, water, prayer, a balanced plate. Eat suhoor. Drink water steadily between Maghrib and Fajr instead of a litre at once. Walk a little. Sleep when you can. Do that, and the research says you will likely finish Ramadan a little lighter, with better blood pressure, cholesterol and blood sugar, and a clearer head. Then keep two or three of the habits after Eid, because the studies are equally clear that the benefits leave as fast as they came if nothing changes.
And remember what the month is for. The health benefits of Ramadan are a gift that comes with the obedience, not the reason for it. If you want help holding the whole month together, the Ramadan Planner 2027 has daily pages, a meal plan section and a tracker for the habits you want to keep.
Sources: Frontiers in Nutrition 2021, “Effects of Ramadan and Non-Ramadan Intermittent Fasting on Body Composition: A Systematic Review and Meta-Analysis”; Nutrition Reviews 2024, “An umbrella review and meta-analysis of meta-analyses of the impact of Ramadan fasting on the metabolic syndrome components.” This article is for general information and is not a substitute for advice from your own doctor.
