Why Am I Not Losing Weight? 10 Common Reasons Explained

If you’ve made positive changes to your lifestyle but are not losing weight despite a healthy diet and regular exercise, there could be a reason.

At first, it may feel like the weight is falling off, but over time, your success can slow or even stop altogether. So, in this guide, we explore 10 of the most common reasons you’re not losing weight and share our top tips to help you get back on track and improve your progress.

A calorie deficit is where you eat fewer calories than your body burns through things like exercise and normal daily activities. It’s a key part of any weight loss journey. So, if you have not cut down on the amount of food you eat, have only focused on increasing exercise, or have made little changes to your lifestyle, you may not be in a calorie deficit.

Try using a food tracking app to help you spot any hidden calories or increased portion sizes, even if they were unintentional. Research indicates that consistently tracking your food intake can lead to significant weight loss.

You can also use our calorie deficit calculator to help you accurately calculate how many calories you need to reach your weight loss goals. If you’re still unsure, consider contacting a dietitian for further advice.

Another common reason for not losing weight is not exercising enough, or not doing exercise intense enough for weight loss, even if you think you might be.

Cardio machines like treadmills, bikes, and hill climbers can overestimate the number of calories you’ve burned. That’s because they use a calculation based on the average person, so they do not account for individual differences, such as your weight, level of fitness, or exercise intensity. So, you could be burning fewer calories than you think, meaning you may not be in a calorie deficit.

Fitness trackers or watches can help you track calories burned more accurately, although they are not perfect either. One study found that wearable devices had an average 27% error rate when calculating energy expenditure.

Cardio exercises are only one part of the story, though. You should try to incorporate strength training into your routine to build muscle and increase your resting metabolic rate, this will help you burn more calories at rest. Try changing up your exercise routine every so often, such as increasing reps. Once your body is used to an exercise routine and you get fitter and stronger, you’ll use less energy to complete it.

Also, do not overlook non-exercise activity thermogenesis (NEAT), which includes activities like walking the dog, gardening, or doing housework. These small activities can also increase your overall energy expenditure.

Have you noticed that your clothes no longer fit properly? Perhaps they feel looser than usual, but when you step on the scales, your weight remains unchanged. If this sounds like you, you could be experiencing body recomposition, where your body is losing fat but gaining muscle. It’s partly why you cannot always rely on the scales to give you an accurate picture of your weight loss journey.

Instead of obsessing over the number on the scales, use a tape measure to track your waist and hip circumference or try using body fat analysis tools like smart scales or Dual-energy X-ray absorptiometry (DEXA) to get a more accurate picture of your progress.

Several hormonal and medical conditions can impact how quickly you lose weight, including:

• hypothyroidism (an underactive thyroid)
• polycystic ovary syndrome (PCOS)
• diabetes

These conditions can affect your metabolism, appetite, and fat storage. Speak to a doctor about medication and other lifestyle changes that can help manage these conditions and help you lose weight.

Some medications, like antidepressants, can cause weight gain. If you think a medication you are taking is affecting your weight, speak to your doctor. Your doctor can assess whether it is time to change your dose, or try a different medication.

Poor sleep disrupts hormones associated with weight, such as increasing the appetite hormone ghrelin by 10%. It can also increase leptin, which signals when you are full, even after 1 night’s sleep deprivation. These hormonal shifts can lead to food cravings, overeating, and contribute to obesity in the long term.

Research also shows that people who suffer long-term stress are more susceptible to obesity. When stressed, the body releases cortisol, a stress hormone that promotes fat storage. Obese people have significantly higher hair cortisol levels compared to those of healthy weight, and the same study showed that high cortisol levels were linked to persistent obesity.

✓ Make sure your bedroom is clean, cool, and dark

✗ Avoid screens (like phones, tablets, and laptops) before bed

✓ Try meditation, breathing exercises, or mindfulness activities to de-stress

✗ Where possible, avoid activities or situations of high stress

✓ Participate in regular exercise

✓ Practice saying no to things you do not want to do

✓ Outsource or delegate tasks that you do not have the capacity to complete

If you’re serious about losing weight, you should look closely at your protein intake. Protein is not just essential after a workout, it’s important for supporting fat loss and maintaining lean body mass.

Protein increases the release of digestive hormones such as peptide YY and glucagon-like peptide-1 (GLP-1), the same hormone that is imitated in popular weight loss medications like Mounjaro and Wegovy.

Eating protein can also reduce the production of ghrelin, also known as the hunger hormone. In doing so, protein helps maintain your resting energy expenditure, that is, the number of calories you burn at rest.

Research also shows that a high protein intake can stop weight gain and is an effective way to promote weight loss, preventing obesity.

Some good examples of protein-rich foods are:

• lean meat (chicken, turkey breast, and beef)
• fish and seafood
• eggs
• low-fat dairy product (Greek yoghurt and cottage cheese)
• legumes (lentils, chickpeas, and edamame beans)
• tofu
• protein powder

Not all healthy foods are low in calories. Foods like nuts, avocados, smoothies, and protein bars are often rich in nutrients, but are also calorie-dense.

This does not mean they cannot be incorporated into your diet, but portion control is essential. Try pre-portioning snacks and checking food labels to gain a better understanding of the calorie content in the foods you eat.

When you’re trying to lose weight, consistency is key. This means sticking to your lifestyle changes, even at weekends, because regular “cheat days” could cancel out your weekly calorie deficit and undo your hard work.

There are things you can do, though, to help you stay on track and stick to your diet and exercise plan, such as:

• plan your meals ahead of time using a meal planner, and order your ingredients ahead of time
• allow room for some flexibility, but try to avoid “cheat days”
• build habits like daily exercise, to support your long-term weight loss goals
• prepare healthy, nutrient-rich “fake-aways”

A weight loss plateau happens when your progress stalls despite continued efforts to lose weight. As your body weight drops, your metabolism adjusts, so you may burn fewer calories than before. Some of the common signs that you’ve hit a plateau are:

• slow or no progress
• no weight loss despite sticking to your diet and exercise plan
• burning fewer calories when working out, even though you’re completing the same exercises, at the same intensity
• feeling less hungry, meaning you eat less, and your metabolism slows down

Although it can be frustrating, there are several things you can do to help you break through a weight loss plateau, including:

1. Change your workout routine – Alter your workout routine to shock your body into burning more calories by increasing exercise intensity, incorporating resistance training, and varying the types of exercises you do.
2. Track your calorie intake – You may need to reassess your calorie intake to ensure you are still in a calorie deficit. Use a food diary or a tracking app to calculate the number of calories you consume daily accurately.
3. Prioritise sleep and recovery – Ensure you are getting sufficient sleep and incorporating rest and recovery days into your routine, as this can help maintain hormone balance and support weight loss.
4. Avoid or limit alcohol – Alcohol contains empty calories. It provides no nutritional benefit but can disrupt your calorie deficit and interfere with your fat-burning ability, contributing to slowed progress or weight gain.

Weight loss takes time. Safe and sustainable weight loss is typically 0.5 to 1 kg per week, with rapid weight loss often leading to muscle loss or weight regain. It’s important not to expect to reach your target weight too soon, as this can be counterintuitive. Instead, focus on the non-scale victories you achieve along the way, which will contribute to your overall goals, like:

• increased energy
• better sleep
• looser clothes
• stronger and longer workouts
• healthier diet habits
• improved confidence

Before you overhaul your entire routine, take a step back and remember that weight loss is not about perfection. Instead, it’s about forming sustainable habits that support your long-term health.

By focusing on simple but effective strategies, you can increase your results, feel more energised, and avoid the common pitfalls that usually slow down or prevent success. Here are our top tips to help you lose weight effectively:

1. Listen to your body – Only eat when you feel hungry and stop when you feel full. Watch out for signs of overtraining or injury as well. If you’re feeling sore, have a rest day or do some lower-intensity exercise or have a walk instead.
2. Include resistance training – Do not just focus on cardio, strength training is also key for building muscle and enhancing your resting metabolic rate.
3. Make sure you rest and recover – Building recovery into your routine is as critical as exercise because overtraining can cause injury and set you back.
4. Mix up your workouts – Experiment with different exercises and activities to find ones you enjoy, which will keep you motivated.
5. Snack smart – Choose healthy snacks like fruit (fresh, frozen, and dried), Greek yoghurt, boiled eggs, and vegetable crudites.
6. Watch your portion sizes – Do not be tempted to increase your portion sizes because even healthy foods can add up.
7. Limit ultra-processed foods – Foods like ham, sausages, crisps, biscuits, and bread are often calorie-dense and will leave you feeling hungry shortly after.