Intermittent Fasting Benefits: What the Evidence Says and How It Fits Dubai Life

Intermittent fasting has moved from niche biohacking to everyday conversation. Colleagues compare eating windows over coffee, apps track fasting hours, and the claims range from easier weight control to better blood sugar and slower ageing. In the UAE, the idea is also deeply familiar for another reason: many residents fast every year during Ramadan.

So what does the research actually show? The honest answer is that intermittent fasting can be a useful tool for some people, the evidence is stronger for some benefits than others, and it is not the right fit for everyone. How you fast, what you eat when you do eat, and your individual health all matter more than the clock alone.

This guide explains the main types of intermittent fasting, the benefits with the best evidence, the claims that are still uncertain, who should be cautious, and how to approach it sensibly around life in Dubai. If you want to understand your own metabolism first, our metabolic health assessment explains what can be measured.

What is intermittent fasting?

Intermittent fasting is an eating pattern that cycles between set periods of eating and fasting. Rather than focusing on what you eat, it focuses on when. The most common approaches are time-restricted eating, such as eating within an eight-hour window each day, and weekly patterns that reduce calories on certain days.

The main types are:

What are the benefits of intermittent fasting?

The best-supported benefits of intermittent fasting are weight loss and improvements in some markers of metabolic health, such as insulin sensitivity, blood pressure and blood fats. Many people also find it a simple structure that reduces snacking. However, studies suggest these benefits are broadly similar to those of other ways of eating fewer calories.

Weight management

For many people, intermittent fasting works mainly because a shorter eating window makes it easier to eat less overall. Reviews of the research generally find that it leads to weight loss similar to standard calorie-reduced diets, rather than more.

Two well-designed trials illustrate this. In a 2020 trial published in JAMA Internal Medicine, Lowe and colleagues found that 16:8 eating without other guidance did not lead to significantly more weight loss than three regular meals a day over 12 weeks. In a 12-month trial published in the New England Journal of Medicine in 2022, Liu and colleagues found that adding an eating window to calorie restriction did not produce significantly more weight loss than calorie restriction alone.

The practical takeaway is that intermittent fasting is one way to eat less, not a shortcut. If it suits your routine and appetite, it can be a helpful structure. If it leaves you overeating later in the day, another approach may work better.

Blood sugar and insulin sensitivity

When you fast, insulin levels fall and the body gradually shifts from using glucose to using stored fat for energy. Some studies suggest intermittent fasting may improve insulin sensitivity, meaning the body needs less insulin to manage blood sugar.

Timing may matter. In a small 2018 study published in Cell Metabolism, Sutton and colleagues found that men with prediabetes who ate within an early six-hour window, finishing by mid-afternoon, showed improved insulin sensitivity and blood pressure even without losing weight. Eating earlier in the day appears to fit better with the body's natural rhythms, although larger studies are needed.

Insulin resistance can develop years before blood sugar results look abnormal, which is why tests such as fasting insulin and HbA1c can be useful before and after a change in eating pattern. Our metabolic health assessment explains how these are measured and read together.

Heart health markers

Some studies have found improvements in blood pressure, cholesterol and triglycerides with intermittent fasting, often linked to weight loss. The effects vary between people, and they depend heavily on overall diet quality. An eating window filled with fried food and sugary drinks is unlikely to help your heart, however long the fast.

A simpler structure for some people

Many people simply find a defined eating window easier than counting calories. Fewer decisions about food, less evening snacking and a natural break from late-night eating can all be helpful. For others, the same structure triggers hunger, irritability and overeating. Both responses are normal.

What about longevity and anti-ageing claims?

Much of the excitement about fasting and longevity comes from animal research and from cellular processes such as autophagy, the body's way of recycling damaged cell components. A 2019 review by de Cabo and Mattson in the New England Journal of Medicine described promising effects, but long-term evidence in humans that fasting extends lifespan is still lacking.

It is reasonable to say that maintaining a healthy weight, good blood sugar control and healthy blood pressure supports healthy ageing, and intermittent fasting can be one route there. It is not reasonable to claim that a particular fasting window slows ageing on its own. Our article on how biological age is measured explains what the current tools can and cannot tell us.

It is also worth knowing that not all findings are positive. An observational study first presented at an American Heart Association meeting in 2024, and published in 2025, linked eating within less than eight hours a day to a higher risk of death from cardiovascular disease. Observational studies like this cannot prove cause and effect, but they are a reminder that the long-term picture is still being established.

Is intermittent fasting good for women?

Intermittent fasting can work for many women, but responses may vary more than in men. Some women find longer fasts affect sleep, energy, mood or menstrual cycles. Gentler windows, such as 12 to 14 hours, adequate protein and avoiding very low-calorie days are often better tolerated, particularly around perimenopause.

Women who are pregnant, breastfeeding, trying to conceive, or who have a history of disordered eating should not follow intermittent fasting without medical advice. For women with polycystic ovary syndrome, where insulin resistance is common, eating patterns may help some people, but this is best discussed with a doctor. Our pages on PCOS and women's hormone health explain the wider picture.

Who should not try intermittent fasting?

Intermittent fasting is not suitable for everyone. People who are pregnant or breastfeeding, under 18, have a history of eating disorders, have type 1 diabetes, or take medicines that lower blood sugar should avoid it unless a doctor advises otherwise. Anyone with a medical condition or on regular medication should check first.

Other groups who should take extra care include older adults at risk of losing muscle, people who are underweight, and those with conditions such as low blood pressure, kidney disease or gout. Fasting can also feel much harder for people who are already under significant stress or sleeping poorly. Our guide to high cortisol symptoms explores how stress and sleep affect the body.

How does fasting affect blood sugar?

During a fast, blood sugar gradually falls and insulin levels drop, prompting the body to release stored glucose and then burn more fat for energy. In healthy people, the body keeps blood sugar within a safe range. In people taking diabetes medicines, fasting can cause blood sugar to fall too low, which is why medical advice is essential.

Some people notice shakiness, headaches or irritability when they first start fasting. These usually settle as the body adjusts, but symptoms such as dizziness, confusion or fainting are a signal to stop and seek advice.

How to make intermittent fasting work around Dubai life

In Dubai, intermittent fasting works best when it fits around the climate and the social calendar. Stay well hydrated, especially in the hot months, choose a window that suits late dinners or early starts, prioritise protein and vegetables in meals, and be flexible around brunches, travel and Ramadan rather than forcing a rigid schedule.

Hydration comes first

Water, plain tea and black coffee are generally fine during a time-restricted fast, and in Dubai's heat, staying hydrated matters. If you exercise outdoors or spend time in the sun during your fasting window, take particular care with fluids and electrolytes.

Choose a window that fits your week

Late dinners are part of social life here, so a window such as noon to 8pm may not suit someone who regularly eats at 9 or 10pm. Some people shift their window on weekends; others choose a gentler 12-hour overnight fast that is easy to keep. Consistency over months matters more than a perfect window.

Make the eating window count

What you eat still matters most. Build meals around protein, vegetables, whole grains, legumes and healthy fats. Adequate protein helps protect muscle, which becomes increasingly important with age and is often overlooked when eating windows shrink.

Ramadan is different

Fasting during Ramadan is a religious practice with its own rhythm: no food or water from dawn to sunset, with meals at suhoor and iftar. Because it includes going without water, it differs from most intermittent fasting plans. People with diabetes or other medical conditions are advised to speak to their doctor well before Ramadan to plan medication and meals safely. Many people find it helpful to pause other fasting plans during the holy month and return to them afterwards.

Pair it with movement and sleep

Fasting tends to work best alongside regular movement, especially strength training, and consistent sleep. Poor sleep increases hunger and makes any eating plan harder to stick to.

Frequently asked questions

Can you drink coffee while intermittent fasting?

Yes, black coffee is generally considered fine during the fasting window of time-restricted eating, as it contains almost no calories. Adding milk, sugar, syrups or cream adds calories and may break the fast depending on how strictly you follow it. Coffee later in the day can affect sleep, and on an empty stomach some people find it unsettles digestion.

What are the benefits of intermittent fasting 16:8?

The 16:8 approach may help some people eat less overall, reduce late-night snacking, and support weight management and blood sugar control. Research suggests its results are broadly similar to other calorie-reduced diets rather than better. It is popular because it is simple to follow, but what you eat in the eight-hour window still matters most.

How long does it take to see results from intermittent fasting?

Many people notice changes in appetite and routine within the first two to four weeks. Weight changes may appear within weeks, while blood markers such as HbA1c are best rechecked after about three months, and all of these depend on overall diet, activity and sleep. Retesting markers such as HbA1c and fasting insulin after a few months can show whether it is working for you.

Is intermittent fasting safe long term?

For healthy adults, intermittent fasting appears safe in studies lasting up to a year or so, but long-term evidence is still limited and some recent observational findings have raised questions. It is sensible to treat it as one option among several, maintain good nutrition and muscle mass, and review it with a doctor if you have any health conditions.

Does intermittent fasting help with skin?

There is little direct research on intermittent fasting and skin. Any benefits are more likely to come from indirect effects, such as improved blood sugar control and fewer sugary snacks, which are associated with healthier skin. A balanced diet, good hydration, sleep and daily sun protection remain far more important for skin health.

A tool, not a rule

Intermittent fasting is neither a magic fix nor a passing fad. For some people, it is a simple, sustainable way to eat a little less and support metabolic health. For others, it adds stress or leads to overeating, and a different approach works better. The research points to the same fundamentals: a good-quality diet, enough protein, regular movement and consistent sleep.

If you would like to understand how your body handles food before changing the way you eat, or you have a health condition and want to know whether fasting is safe for you, book a consultation with our longevity team in Business Bay. Dr. Jenna Burton, who works across functional health, nutrition and longevity medicine, can help you measure your metabolic health first, so you can see what any change is actually doing.