How to Lose Belly Fat in Singapore

Can you lose belly fat by doing crunches?

No. Spot reduction, the idea that working a muscle burns the fat over it, keeps failing direct tests. In a randomised trial, 24 sedentary adults did seven abdominal exercises, two sets of 10 each, five days a week for six weeks, on a steady diet.

Other studies agree. When 11 young adults trained one leg for 12 weeks, at 960 to 1,200 leg-press repetitions a session, they lost 5.1% of their fat mass from the arms and trunk, not the trained leg (Ramirez-Campillo, 2013). In 104 people training one arm for 12 weeks, callipers hinted at a small local effect in men, but MRI, the more complete measure, found no difference (Kostek, 2007).

Keep the ab work for a stronger trunk, and look elsewhere for the fat.

What is visceral fat, and why does it matter more?

The deeper of the two kinds of belly fat, packed around the internal organs. It matters more because it is metabolically active.

Independent means risk on top of body weight. So HealthHub warns that someone with a normal BMI can still carry central obesity, which carries more risk than general obesity.

Where fat goes is partly out of your hands. HealthHub notes apple-shaped fat around the middle is more common in men, women more often store fat on the hips and thighs, and stress, through the hormone cortisol, can increase visceral fat storage.

What waist size and BMI are too high in Singapore?

Lower than international cut-offs, as Asians carry more risk at a smaller size. For Asian adults a BMI from 23.0 is moderate risk, from 27.5 high risk, and a waist above 90 cm in men or 80 cm in women is abdominal obesity.

Sources: the HPB-MOH obesity clinical practice guidelines (HPB-MOH, 2016), replacing the international 102 cm and 88 cm waists. HealthHub uses the same BMI bands (HealthHub) and waists (HealthHub). The NHS applies 23 and 27.5 to South Asian, Chinese and other Asian backgrounds.

The reason is body fat. A Singapore study measuring it directly found the fat a European carries at a BMI of 30 at about 27 in Chinese and Malays, and 26 in Indians. A WHO expert consultation found a substantial share of Asians at high risk of type 2 diabetes and heart disease below a BMI of 25, and proposed 23 and 27.5 as points for public health action.

In 2022, 11.6% of residents aged 18 to 74 were obese, up from 10.5% in 2019/2020 (National Population Health Survey, HealthHub).

What is a healthy waist-to-height ratio?

Below 0.5, meaning a waist less than half your height. NICE guideline NG246, published in January 2025, tells clinicians to measure waist-to-height ratio alongside BMI in adults with a BMI under 35, and classes 0.4 to 0.49 as healthy, 0.5 to 0.59 as increased risk and 0.6 or more as further increased risk, for both sexes and all ethnicities (summarised by GPnotebook). The NHS puts it for the public as keeping your waist to less than half your height.

It is the easiest measure to use because it scales with your frame. Divide your waist by your height, in the same units. At 1.60 m, half your height is 80 cm, the same as HPB's cut-off for women. At 1.75 m it is 87.5 cm, a little stricter than HPB's 90 cm for men. Treat whichever number you cross first as your signal to act.

What actually reduces visceral fat?

An overall calorie deficit, and visceral fat responds well. A systematic review of 61 studies found it falls faster in percentage terms than fat under the skin with modest weight loss, an edge that shrinks as loss grows, whatever the method.

SingHealth on HealthHub agrees: losing weight healthily is the most effective way to reduce it (HealthHub). Here the deficit is built at the hawker centre: the hawker eating guide goes dish by dish.

Exercise helps even without dieting, aerobic work most. A meta-analysis of 15 studies (852 people) found moderate or high intensity aerobic training cut it by more than 30 cm² on CT in women and 40 cm² in men, even within 12 weeks. A second meta-analysis of 35 trials found aerobic exercise beat no exercise, and resistance training alone did not.

Head to head in overweight adults: STRRIDE AT/RT.

Do you need strength training as well as cardio?

Yes, for a different reason. Weights did not shift visceral fat, but they protect the muscle a deficit would otherwise take. In STRRIDE AT/RT, lifters gained more lean mass, while the aerobic and combined groups lost more fat.

Singapore asks for both. HealthHub: 150 to 300 minutes of moderate aerobic activity a week plus muscle strengthening on at least 2 days (HealthHub). For weight loss, HPB-MOH: 150 to 420 minutes a week, strength on two non-consecutive days (HPB-MOH, 2016).

In the heat, walk after dinner or early morning, on a park connector or covered mall link. Lift in a condo gym, at home with dumbbells or at a fitness corner. Borderline blood sugar? Exercise for prediabetes sets out the same split around glucose.

Does alcohol cause belly fat?

Heavy drinking is linked to it. Moderate drinking is less clear. A systematic review of 47 studies on beer found the evidence too weak to say whether under 500 ml a day affects waist size, but intakes above 500 ml a day may be linked to abdominal obesity.

Alcohol brings calories with it as well: a 330 ml can of beer is 135 kcal and a 100 ml glass of wine is 89 kcal on HPB's SG FoodID figures.

SingHealth's advice on HealthHub for visceral fat includes avoiding or limiting alcohol (HealthHub). HPB's limit for people who drink is two drinks for men and one for women in a session, with the reminder that no amount is free of health effects (HealthHub).

Can poor sleep or stress add belly fat?

Sleep can, in at least one tightly controlled study. In a 21-day inpatient trial published in JACC in 2022, 12 healthy, non-obese adults spent 14 days with either 4 or 9 hours of sleep opportunity a night and free access to food.

On short sleep they ate more and gained more weight. Total body fat did not differ between the two conditions, but abdominal fat rose only during the short-sleep phase, in both the subcutaneous and the visceral layers.

HPB suggests adults aim for about 7 hours (HealthHub). On stress, HealthHub says raised cortisol can increase visceral fat storage (HealthHub). Neither replaces the deficit, but both make it harder to hold. The guide to why you are not losing weight covers what short sleep does to the fat-to-muscle split of a diet.

Why is fat loss not the same as weight loss?

Weight is fat plus muscle, water, stored carbohydrate and gut contents, and only the fat is the target. HealthHub is blunt that weighing scales are not an accurate representation of how much body fat you have (HealthHub).

In STRRIDE AT/RT lifting added lean mass while aerobic work removed fat, so the combined group's scale change understated their fat loss. Track these instead.

1. 01Waist, every two weeksSame tape, close to the skin, midway between lowest rib and top of hip bone, read breathing out (HealthHub). Morning, before food.
2. 02Photos, every four weeksFront and side, same spot, light and clothes. They catch what the tape misses.
3. 03Weight, as a weekly averageUseful, but last in line.
4. 04Clothes and belt notchCrude, free and honest.

Waist falling, weight flat: you are losing fat and holding or gaining muscle, the aim of body recomposition.

How long does it take to lose belly fat?

Months, not weeks, and nobody can promise a number. Singapore's guidelines aim for 5-10% of body weight over six months, at no more than 0.5 to 1 kg a week (HPB-MOH, 2016).

Expect to adjust the plan there.

When should belly fat send you to a doctor?

This page is general information, not a diagnosis. See a doctor in any of these cases:

1. 01Your waist is above HPB's cut-offs or more than half your heightThe NHS lists a waist larger than half your height among the reasons to see a GP, along with diabetes, high blood pressure or a family history of obesity (NHS). HealthHub links waists of 90 cm and above in men and 80 cm and above in women to higher type 2 diabetes risk (HealthHub).
2. 02Your belly is swollen rather than softThe NHS treats a swelling or lump in the tummy, or bloating with stomach ache, vomiting or fever, as a reason for an urgent appointment, and bloating with unintended weight loss or blood in your poo as a reason to see a GP (NHS). That is not fat.
3. 03Weight is moving to your middle in your 40s or 50sFor women, perimenopause weight gain and training covers what changes and what to ask your doctor.
4. 04You plan to start hard trainingWith heart disease, diabetes, high blood pressure or chest symptoms on exertion. Get cleared first.

How does a Fit Titans coach fit in?

A coach does not change the biology. A coach makes the aerobic minutes and two strength sessions happen, adjusts the load as you get fitter, and keeps the waist measurements honest.

Fit Titans matches you with a verified freelance coach at home, in your condo gym, at a park or a Gym Pod, with no membership. Verified means we checked their certification against the issuing body, matched their experience to your goal, followed up references and assessed their coaching in person.

The first session is a paid trial at 10% off. Then packs: 5 sessions at the full rate, or 10, 15 or 20 sessions at 5%, 10% or 15% off, and sessions do not expire. How it works: weight-loss coaching.