Why Weight Loss Plateaus Happen After the First Few Weeks
Written by Mackayla Brennan
Content writer and Nutrition student
Mackayla Brennan is a health and nutrition content writer at Hercules Supplements. She focuses on creating evidence-based content on digestion, gut health and nutrition, helping everyday Australian's translate complex research into practical dietary advice.
Why Fat Loss Fails After Week 3
The first two weeks of a weight loss journey are often exhilarating. You’re fueled by motivation, your meal prep is on point, you’re hitting your goals, and the scale seems to reward your efforts every single morning. Many people see a significant drop in body weight during the first 14 days, which can feel incredibly encouraging. Then week three arrives… and suddenly the scale stops moving. This is an incredibly common phenomenon during weight loss, and understanding why it happens can prevent a lot of unnecessary frustration. To understand the slowdown, we first need to understand why things move so quickly at the beginning.
The "Honeymoon" Phase of Weight Loss
The first two weeks of a weight loss journey are often called the “honeymoon phase.” During this stage, your body is responding to the changes you’ve made, and weight loss often happens more rapidly. In this phase, your body is primarily using glycogen for energy. Glycogen is a form of stored carbohydrate found in your muscles and liver that your body can access quickly. Glycogen is stored with water, so when your body burns through these glycogen stores, it also releases a significant amount of water. This is why early weight loss often happens very quickly, much of it is water weight which can significantly have an impact on the scales.
Secondly, people may also experience reduced inflammation when they shift from a high-sugar, highly processed diet to a more whole-food-based eating pattern. As your calorie intake decreases, your body may gradually adapt by conserving energy. Over time, this can slightly reduce the number of calories you burn, which is one reason progress may slow and extremely low-calorie diets can be difficult to sustain.
Why Weight Loss Slows in Week Three
By week three, glycogen levels have stabilised and most of the easily lost water weight has already dissipated. Now the body has to do the harder work: oxidising stored body fat (adipose tissue). Fat loss is a far more complex and slower metabolic process than losing water weight. This is why progress on the scale often slows down after the initial drop. But this doesn’t mean fat loss has stopped. It simply means your body has moved past the honeymoon phase and is now doing the real work.
Tips to Help You Push Past a Plateau
1. Track your intake honestly
It’s easy for small extras to add up without noticing. Tracking your meals, snacks, drinks, and portion sizes can help you stay aware of your calorie intake and identify areas that may be slowing progress.
2. Prioritise protein at every meal
Protein plays an important role during weight loss because it helps preserve lean muscle mass and keeps you feeling fuller for longer. Including a quality protein source in each meal can help reduce hunger and support better body composition.
3. Manage stress levels
Stress can make weight loss harder by increasing cortisol, which may affect appetite, cravings, and fat storage. Simple strategies like daily walks, breath work, stretching, or meditation can help regulate stress and support your results.
4. Limit or avoid alcohol
Alcohol adds extra calories without offering much nutritional value. It can also affect food choices, recovery, sleep, and your body’s ability to burn fat efficiently, making it harder to stay on track.
5. Increase your fibre intake
Fibre helps keep you full, supports healthy digestion, and can make it easier to manage appetite throughout the day. Whole foods like vegetables, fruit, legumes, and whole grains are great ways to increase fibre intake.
6. Make sleep a priority
Sleep is one of the most overlooked factors in weight loss. Poor sleep can affect hunger hormones, energy levels, recovery, and decision-making, all of which can make healthy habits harder to maintain.
7. Don’t rely only on the scale
The scale doesn’t always reflect real progress. Water retention, sodium intake, stress, hormonal changes, and digestion can all cause fluctuations. Progress photos, body measurements, energy levels, and how your clothes fit can often give a more accurate picture.
The Bottom Line
Weight loss is rarely a perfectly linear process. The rapid results seen in the first few weeks are often influenced by water weight and glycogen depletion. Once that phase passes, progress typically slows as the body begins burning fat more gradually. Experiencing a plateau doesn't mean your efforts aren't working. In most cases, it simply means your body has moved past the honeymoon phase and is adapting to the changes you've made. Consistency with your daily habits is what drives long-term results, even when the scale doesn’t move as quickly as you’d like.
Frequently Asked Questions
Why do I lose weight quickly in the first two weeks?
Most early weight loss is a combination of water loss, glycogen depletion, and reduced inflammation. While this drop can be encouraging, it doesn’t always reflect pure body fat loss.
Why has my weight loss slowed down in week three?
By week three, your body has usually used up much of its stored glycogen and excess water. At that point, progress often slows because fat loss is a slower process than losing water weight.
Does a weight loss plateau mean my diet isn’t working?
Not necessarily. A plateau is often a normal part of the process and doesn’t always mean fat loss has stopped. Changes in water retention, stress, sleep, hormones, and digestion can all affect the number on the scale.
How can I break through a weight loss plateau?
Focus on the basics: track your intake accurately, prioritise protein and fibre, manage stress, get enough sleep, reduce alcohol, and avoid relying only on the scale to measure progress.
References
Franziska Spritzler. (2017, February 27). 12 Simple Ways to Break Through a Weight Loss Plateau. Healthline; Healthline Media. https://www.healthline.com/nutrition/weight-loss-plateau#dont-rely-on-scale
Owens, N. (2025, June 20). What Is a Weight Loss Plateau? WebMD. https://www.webmd.com/obesity/weight-loss-plateau
