Why has my weight loss plateaued?

Quick facts: Weight loss plateaus are common and can be caused by various factors, including water retention, unnoticed higher calorie intakes, reactions to poor sleep or stress, gaining or losing muscle mass, or even your body’s ability to adapt to reduced intake and increased activity levels. In many cases, making a small adjustment to diet or activity levels helps to kickstart progress again. Those taking weight loss medications should seek medical advice and never alter dosage without supervision.

A weight loss plateau can feel frustrating, especially when you’ve been making consistent changes and expect to keep seeing progress. It’s a common part of many weight loss journeys, though, and it doesn’t mean your efforts aren’t working.

In this guide, we look at some of the potential reasons why weight loss can slow down or stop for a while, helping you to better understand what may be happening in your body.

Why does weight loss plateau?

Weight loss plateaus can happen for a wide variety of reasons, and it’s not always obvious which one may be affecting you. Your body, routine, activity levels, eating habits, sleep and stress can all play a part, and sometimes several factors may be involved at once.

This is very normal. Many people experience periods where progress slows or stops, even when they’re still making healthy choices. In most cases, small adjustments to your routine can be enough to kickstart your weight loss progress again, supporting steady, sustainable results.

Below are some of the most common causes for a weight loss plateau.

Your metabolism has adapted

As you lose weight, your body needs less energy to carry out everyday functions. This means the number of calories you burn each day can gradually decrease. Your metabolism may also adapt by becoming more efficient, especially if you’ve been eating fewer calories for a while.

As a result, the calorie deficit that helped you lose weight at first may become less effective, which can cause your progress to slow or plateau.

Your consumption has increased

Consuming more calories than you realise can make it seem like your progress has halted for no reason. Whether you’re celebrating something, off on holiday or enjoying a meal with loved ones, it can be easy to eat a little more than you usually do – and that’s okay.

Even small increases in calorie intake can reduce your calorie deficit, which may slow progress, but the important thing isn’t to avoid these instances altogether. It’s to get back on track afterwards and keep making the changes that have supported your weight loss so far.

Remember, progress isn’t about perfection. It’s fine to let things slide for a short time – life gets in the way! Sticking to your healthy habits around little imperfections like these is the key to making real, lasting changes.

You’ve lost – or gained – muscle mass

Generally speaking, muscle tissue uses more energy than fat, even when you’re resting. If you lose muscle during weight loss, your body may burn fewer calories each day. This can make your calorie deficit less impactful, slowing progress over time.

Muscle loss can happen if you’re not eating enough protein or not doing enough strength-based activity alongside your weight loss efforts.

Equally, gaining muscle mass can make it look like you’re not making progress, too! Muscle tends to be heavier and more dense than fat, so it can appear that your weight is staying the same if you’re losing fat and replacing it with muscle.

You’ve adjusted to your current activity level

The human body is really good at its job, and if your activity levels stay relatively the same over time, the body can adapt to become more efficient at what it’s used to. This can happen if you:

• Walk the same routes regularly
• Do the same workouts every time you exercise
• Follow the same daily routine with little variation.

Fortunately, there’s a simple fix for this. Adding variety, increasing intensity or moving more throughout the day can help to make your body work a little harder again and restart your progress.

You’re stressed or tired

Although they might seem completely unrelated, stress and tiredness can affect your weight loss progress in two key ways: mentally and physically.

Firstly, if you’re stressed or tired, it can feel much harder to stick to healthy habits like exercising or preparing balanced meals. It may feel preferable to opt for the ‘easy’ option, like opting for a takeaway or skipping your workout.

On top of that, both a lack of sleep and higher levels of stress can increase the level of certain hormones, including ghrelin, in your body. Ghrelin stimulates your appetite, making you feel hungrier, and in turn often leading to a higher calorie intake.

You’re retaining fluids

Fluid retention can make it look like your weight loss has plateaued, even when you’re still losing body fat. Your body can hold onto extra water for many reasons, including hormonal changes, salty meals, stress, exercise or warmer weather.

This can temporarily affect the number you see on the scales. It’s usually normal and often settles on its own, so try to look at progress over several weeks.

Weight loss plateaus are common and can happen for many different reasons, even if you’re taking weight loss medication such as Mounjaro or Wegovy.

This doesn’t mean your progress has stopped for good – with the right support and small, realistic changes, you can continue working towards your health goals.

FAQs

What’s a weight loss plateau?

A weight loss plateau is when your weight stays roughly the same for a period of time, even though you’re still following your usual healthy eating, activity or weight loss routine.

It can happen because your body adapts as you lose weight, meaning you may burn fewer calories than before. Plateaus are common and don’t mean you’ve failed – they’re a normal part of many weight loss journeys.

How to know if you‘ve hit a weight loss plateau

You may have hit a weight loss plateau if your weight has stayed roughly the same for several weeks, despite continuing with your usual eating and activity habits.

Daily weight changes are normal, so it’s best to look at your overall trend rather than one weigh-in. If your progress has slowed or stopped for 3 to 4 weeks, and your routine hasn’t changed much, it could be a plateau.

What to do in a weight loss plateau

Try making small, realistic changes rather than starting again – or worse, giving up – completely. You could review portion sizes, increase daily movement, add variety to your workouts or focus on getting enough sleep.

It can also help to track your progress over several weeks, not just day to day. If you’re using weight loss medication, speak to your healthcare provider or pharmacy team for personalised advice. Never change your dose unless your prescriber recommends it.