Exercise and Sleep for Weight Control

Sitting for long periods and doing little activity lowers daily energy use and loses muscle over time, and less muscle means the body burns less energy at rest. Short sleep (regularly under about 7 hours) is linked in many studies to higher weight; it changes hunger hormones, increases appetite and cravings for sugary and fatty food, and reduces the energy to be active. In one randomised trial of adults with overweight who usually slept under 6.5 hours, extending sleep towards 7 to 8 hours reduced calorie intake by around 270 kcal a day without being asked to diet. Untreated obstructive sleep apnoea (breathing pauses in sleep) is both caused by excess weight and makes weight control harder. Shift work, late-night screen use and late meals add to the problem.

Overweight and obesity affect a large share of adults in Saudi Arabia and worldwide, and low physical activity and short or irregular sleep are both common. Many adults in the Gulf region do much less activity than the World Health Organization advises, partly because of heat, car-based travel and desk-based work.

In the hot months, walk early in the morning or after sunset, or use indoor tracks and malls; drink water and avoid exercising in midday heat. Walking paths and “walkability” have grown in many Saudi cities as part of the Quality of Life programme. In Ramadan, sleep is often split and shifted to the day; try to protect a main block of sleep, take a short daytime nap, and keep light activity such as a walk about one to two hours after iftar rather than hard exercise just before the fast starts. Avoid heavy fried food and sweets late at night.

Your doctor looks at your weight, waist size, blood pressure, blood sugar, cholesterol and liver tests, and asks about activity, sleep, snoring, mood and medicines that can raise weight. A short questionnaire may screen for sleep apnoea, and a sleep study may be arranged. Before starting a harder exercise programme, people with heart or lung disease, diabetes, or many risk factors should be checked by a doctor.

Start where you are, increase slowly, and choose activities you enjoy. Any movement counts.

• Build up towards 150 minutes a week of brisk walking or similar activity, for example 30 minutes on 5 days, or three 10-minute walks a day. If you are new to exercise, start with 10 minutes.

• Add muscle-strengthening on 2 or more days a week: body-weight exercises, resistance bands, light weights or machines.

• Break up long sitting every 30 to 60 minutes with a short walk or stretch.

• Aim for at least 7 hours of sleep, with regular sleep and wake times, a dark cool bedroom, and no screens or heavy meals in the hour or two before bed.

• Limit caffeine in the afternoon and evening; coffee and strong tea can delay sleep for many hours.

• Track steps, minutes or how you feel rather than the scale alone.

Food has the largest effect on weight, and it works together with activity. A dietitian can tailor a plan to your culture, budget and medical conditions.

• Keep enough protein, especially on days you exercise, to protect muscle while losing weight.

• Do not rely on very low-calorie crash diets; they cost muscle, are hard to sustain and often end in regain.

• Have a light snack with some protein if you are hungry before bed, rather than a large late meal.

• Drink water through the day, especially when exercising in warm weather.

No medicine replaces activity and sleep, but some conditions and medicines affect weight and rest.

• Ask your doctor whether any of your medicines can raise weight or cause drowsiness (for example some steroids, antidepressants, antipsychotics, insulin and some anti-seizure medicines). Never stop them yourself.

• Prescription weight-loss medicines may be offered to some adults alongside lifestyle change; see our page on weight-loss medicines.

• Avoid over-the-counter sleeping pills and “slimming” or “fat-burner” products; some are unsafe or unregulated. Ask your pharmacist first.

• If sleep apnoea is confirmed, treatment (such as a night-time breathing device) improves sleepiness and blood pressure.

When lifestyle and medicines are not enough, procedures can help some people, but they still work best with activity and good sleep.

• A sleep study can diagnose sleep apnoea.

• Weight-loss (bariatric) surgery or endoscopic procedures are options for selected people; see the related pages.

• A physiotherapist or exercise professional can design a safe programme if you have joint pain, heart or lung disease, or have had surgery.

The WHO 2020 guidelines advise adults to do at least 150 to 300 minutes of moderate activity (or 75 to 150 minutes of vigorous activity) each week, plus muscle-strengthening on 2 or more days. Exercise on its own usually produces modest weight loss in trials, because the body adjusts and people often eat more, but it improves fitness, blood sugar, blood pressure and liver fat even when weight changes little, and it is among the strongest predictors of keeping weight off after a diet. Resistance training helps to preserve muscle during weight loss, which is especially important with weight-loss medicines or after bariatric surgery. For sleep, the American Academy of Sleep Medicine and Sleep Research Society recommend at least 7 hours a night for adults. Trial evidence that lengthening sleep reduces calorie intake is encouraging but comes from small, short studies, so the long-term effect on weight is not yet proven.

Most people who become more active and sleep better feel the benefit within weeks, in energy, mood, fitness and blood sugar, long before large weight change. Weight tends to plateau as the body adapts, and this is normal rather than failure. Small steady changes that you can keep for years work better than strict plans that you drop after a month.

• Is it safe for me to start exercising, and what should I avoid?

• Could I have sleep apnoea, and do I need a sleep study?

• Are any of my medicines making it harder to control my weight?

• Can I be referred to a dietitian or a physiotherapist?

• How should I exercise and sleep during Ramadan?

This guide comes from the Saudi Gastroenterology Association (SGA) patient library, prepared by the Approved for publication by SGA; individual clinician review is ongoing. Last reviewed: 2026-04-24. It is for education and does not replace your doctor's advice.