6 unexpected reasons you're not losing weight (and how to fix them)

"I feel like I don't really eat much, so why am I not losing weight?" This is one of the most common — and frustrating — questions I hear from clients. You're eating what you think is healthy, exercising regularly, yet the scale refuses to cooperate.

If this sounds familiar, take a deep breath. You're not alone, and it's not a matter of willpower. Often, the barriers to weight loss are hiding in plain sight — small, unexpected factors that most people never consider.

Here are six surprising reasons you might be struggling to lose weight, backed by science, along with practical fixes.

1. You're eating more calories than you realise (even from "healthy" foods)

Research consistently shows that most people underestimate their calorie intake by 30–50%. This isn't about lying — it's about human nature. We forget the handful of nuts here, the splash of oil there, the "just a bite" of a colleague's snack.

Healthy foods still contain calories. Avocados, nuts, olive oil, granola, and smoothies are nutritious but calorie-dense. A single "healthy" smoothie can easily contain 400–600 calories — a substantial portion of your daily needs.

Fix: For one week, track everything you eat and drink using an app like MyFitnessPal. Don't change anything — just observe. You might be surprised by where your calories are actually coming from.

2. You're not sleeping enough (or sleeping poorly)

Sleep and weight are intimately connected. When you're sleep-deprived, your hunger hormones go haywire: ghrelin (the hunger hormone) increases, while leptin (the satiety hormone) decreases. This means you feel hungrier and less satisfied after eating.

Even more insidious: sleep loss increases cortisol (stress hormone), which encourages belly fat storage and muscle breakdown. A 2022 study found that people who slept 5.5 hours per night lost 55% less fat than those who slept 8.5 hours — despite eating the same diet.

Fix: Prioritise 7–9 hours of quality sleep. Create a consistent bedtime routine, avoid screens an hour before bed, and keep your bedroom cool and dark. Treat sleep as non-negotiable, like exercise.

3. Chronic stress is working against you

Modern life in Singapore is stressful — long working hours, high living costs, constant connectivity. When stress becomes chronic, your body stays in fight-or-flight mode, pumping out cortisol.

High cortisol doesn't just increase appetite (especially for sugary, fatty "comfort foods") — it also directs your body to store fat, particularly visceral belly fat. Even if you eat perfectly, chronic stress can sabotage your efforts.

Fix: Incorporate daily stress-reduction practices. This doesn't have to be an hour of meditation. Try 10 minutes of deep breathing, a short walk without your phone, or a hobby that engages your hands and mind.

4. You're over-exercising (yes, that's a thing)

Exercise is essential for health, but more isn't always better. Excessive high-intensity training without adequate recovery can chronically elevate cortisol, increase inflammation, and raise appetite — all of which can stall weight loss.

Signs of overtraining include persistent fatigue, poor sleep, irritability, decreased performance, and getting sick often. If this sounds familiar, your body may be in a state of chronic stress from exercise.

Fix: Balance is key. Include rest days, prioritise sleep, and incorporate lower-intensity activities like walking, yoga, or tai chi. Remember: you lose weight in the kitchen, but you gain health in the gym. Don't use exercise to "earn" food.

5. Medical conditions or medications are interfering

Sometimes, weight loss resistance has a medical cause. Conditions like hypothyroidism (underactive thyroid), polycystic ovary syndrome (PCOS), insulin resistance, and sleep apnoea can make weight loss significantly more difficult.

Certain medications can also cause weight gain or make weight loss harder: antidepressants (especially SSRIs), antipsychotics, beta-blockers, steroids, and some diabetes medications.

Fix: If you've tried everything and the scale won't budge, see your doctor. A simple blood test can check your thyroid, blood sugar, and hormone levels. Never stop prescribed medications without medical advice — but your doctor may have alternatives.

6. You're not eating enough (yes, really)

This sounds counterintuitive, but chronically undereating can backfire. When you consume too few calories for too long, your body adapts by lowering your metabolic rate — meaning you burn fewer calories at rest.

Your body doesn't know the difference between intentional dieting and a famine. It will protect its fat stores by reducing energy expenditure, decreasing non-exercise movement (like fidgeting), and increasing hunger hormones.

Fix: Instead of severe calorie restriction, aim for a moderate deficit (250–500 calories below maintenance). Eat enough protein (1.6–2.2 g per kg of body weight) to preserve muscle. Consider reverse dieting — slowly increasing calories to boost metabolism before trying to lose weight again.

Bonus: The Singapore context

Living in Singapore presents unique weight management challenges: hawker centre culture (delicious but often calorie-dense), long working hours that limit meal prep, air-conditioned environments that reduce incidental movement, and the "kiasu" mentality that can drive over-exercising or extreme dieting.

The key isn't perfection — it's awareness. You can enjoy hawker food by choosing lighter options (yong tau foo with less sauce, sliced fish soup with extra vegetables), sharing portions, and eating mindfully rather than while scrolling your phone.

The bottom line

If you've been struggling to lose weight, stop blaming your willpower. Weight loss resistance is rarely about laziness or lack of discipline — it's often about hidden biological and environmental factors working against you.

Start with one change: track your food for a week, improve your sleep, or add a 10-minute stress break to your day. Small, sustainable shifts are far more effective than drastic measures you can't maintain.

And remember: health is more than a number on a scale. Focus on how you feel, your energy levels, your strength, and your relationship with food. The scale will eventually follow — but it's not the only measure of success.