How Much Weight Can I Lose in a Week?

Medically reviewed by: Kristin Baier, MD

Weight loss can be a challenging and often frustrating process. Many expect quick results, in part thanks to the false promises touted in marketing messages: “Shed 30 lbs in a month!” is tempting language, but these claims—whether by diet book writers or fitness gurus—rarely hold true. In fact, crash dieting may cause more harm than good in the long run.

Rather than focusing on rapid weight loss, it's important to prioritize making small, sustainable changes to your lifestyle. That way, a week’s worth of moderate progress eventually translates into months and years of gradual improvement to your overall health. 

How much weight can you realistically lose in a week? In general, a safe and sustainable rate of weight loss is 1-2 pounds per week. However, the exact amount for you as an individual may be different and may vary depending on a wide range of factors, including your starting weight, medical history, genetics, and more. 

Try not to place too much emphasis on how many pounds you’re losing when you start working towards a weight loss goal. Instead, concentrate on how you’re feeling—noticing, for example, improvements in energy levels, mood, and sleep. These are all indicators of your overall health. 

In this article, we’ll take a closer look at: 

• Some of the factors that influence rate of weight loss 
• The risks of crash dieting
• How to lose weight safely and sustainably by lowering your metabolic set point

What is metabolism and how does it affect weight loss? 

Metabolism is an all-encompassing term used to describe essential chemical reactions within the body that work to convert the food that we eat into the energy we need to perform our daily functions. 

Your metabolism is determined by a complex network of hormones, molecular messengers, organs, and the brain working together to carry out essential functions of your body. When you consistently reduce calories, your body will make adjustments to your metabolism to defend its set point. 

Many factors can influence your metabolism and your set point, including age, gender, genetics, medical conditions, medical history, medications, activity level, diet, and body composition. Of course, not all of these factors can be changed—but it is possible to lower your set point in order to sustain weight loss long-term. 

Risks of crash dieting

Crash dieting involves drastically reducing calorie intake or changing eating/exercise habits over a short period of time to achieve rapid weight loss. While it may seem appealing to lose weight quickly, crash dieting can have several risks and negative effects on your body and overall health. These risks may include: 

1. NUTRITIONAL DEFICIENCIES: Crash diets often severely restrict calorie intake and limit the variety of foods you can eat. This can lead to inadequate intake of essential nutrients such as vitamins, minerals, proteins, and healthy fats. Nutritional deficiencies can result in fatigue, weakened immune system, hair loss, brittle nails, and other health problems.
2. MUSCLE LOSS: Rapid weight loss through crash dieting can cause an accelerated rate of muscle loss along with fat loss. When the body is deprived of calories, it may break down muscle tissue for energy. 
3. METABOLIC CHANGES: Crash dieting can slow down your metabolism, as your body adapts to the reduced calorie intake by conserving energy. A slower metabolism can make it difficult to continue losing weight and can lead to weight regain once normal eating patterns are resumed.
4. GALLSTONES: Rapid weight loss, especially when it occurs over a short period, can increase one’s risk of developing gallstones. Gallstones are solid deposits of digestive fluid, cholesterol, and bilirubin that form in the gallbladder and can cause severe abdominal pain and other complications.
5. PSYCHOLOGICAL EFFECTS: Crash dieting can have negative psychological effects, including increased risk of developing eating disorders like anorexia or bulimia. The extreme restrictions and focus on weight loss can lead to an unhealthy relationship with food, body image issues, and a preoccupation with dieting.
6. WEIGHT REGAIN: Crash dieting is often not sustainable in the long run. Once the restrictive diet is stopped, there is a high likelihood of regaining the lost weight as your body naturally begins to return to its set point. Rapid weight loss can also disrupt the body's natural hunger and fullness cues, making it challenging to maintain a healthy eating pattern.

Long story short: Avoid crash dieting! Instead, prioritize gradual and sustainable weight loss methods that involve balanced nutrition, regular physical activity, and support from a healthcare professional. They’ll help develop a personalized plan that suits your needs and promotes overall well-being.

The Calibrate difference

Importantly, Calibrate’s Metabolic Reset is not a diet—and unlike many of the crash diets you may have heard about, Calibrate focuses on metabolic health as the primary goal, not the number on the scale. 

Our program is designed to help you make sustainable and personalized adjustments to your food, sleep, exercise, and emotional health habits. These changes are tailored to your specific circumstances and easy to incorporate into your daily routine.

When you join Calibrate, you'll start with a 30-minute virtual doctor's appointment where you'll have a detailed discussion about your lab panels and health history. Based on a thorough review, your doctor will determine if a GLP-1 medication is clinically appropriate. Clinical studies have shown this class of medication to be safe and effective for weight loss.

GLP-1s prescribed by Calibrate include semaglutide, tirzepatide, and liraglutide, known under brand names like Ozempic® and Mounjaro®, among others. These medications are FDA-approved and work by mimicking the natural GLP-1 hormone your body produces, which targets areas of the brain involved in regulating appetite and food intake. It also has an important impact on the management of blood sugar levels.

GLP-1 medication will play a key role in your big-picture weight loss plan; however, it's the use of medication alongside lifestyle intervention that sets the stage for long-term success. 

Coaching, support, and the Four Pillars of Metabolic Health

When you join the Calibrate program, you’ll also be matched with a coach who will act as your cheerleader and accountability partner, celebrating your successes and helping you keep your commitments. You’ll meet with your coach over 15-minute video sessions every other week. 

Meanwhile, you’ll work with your Calibrate Medical Team to monitor progress and gain unlimited access to an in-depth curriculum designed by our Expert Council and Clinical Advisory Board. The curriculum provides evidence-based, intensive lifestyle intervention that will boost the effectiveness of your GLP-1 medication and help you reach your metabolic health and weight loss goals.

The Calibrate curriculum centers on the Four Pillars of Metabolic Health: Food, sleep, exercise, and emotional health. You’ll work with your coach to make progress in each of these areas: 

• FOOD: Calibrate’s food philosophy will help you find ways to eat more mindfully, while also help establish a sustainable and flexible approach to nutrition that focuses on minimizing fast-digesting carbs and making healthier choices that include fiber and healthy proteins and fats—without restricting or counting calories. These small and sustainable changes to your meal plan won’t just work to lower your blood sugar and improve your gut and overall health, you’ll also feel more in control of what you eat.
• SLEEP: Getting quality sleep is crucial to our brain and metabolic health. But consistency is also key: A 2018 study found a strong correlation between irregular sleep times and an increased risk of cardiometabolic health factors. At Calibrate, you will learn how to develop a schedule to improve sleep quality and minimize cardiometabolic health factors with 7-9 nightly hours of restful sleep. 
• EXERCISE: It’s no secret that regular exercise can have a ripple effect of benefits on your overall health. Multiple studies show that exercise can improve your heart health, bone health, reduce your risk of cancer and risk of type 2 diabetes, and boost your mood. Calibrate’s exercise approach focuses on prioritizing 150 minutes of movement each week, making it a regular and positive part of the day, and incorporating resistance training over time to improve metabolic health.
• EMOTIONAL HEALTH: We all know what it feels like to be stressed—whether your muscles tense up, your throat tightens, or your heart starts to beat faster, chronic stress can have a lasting impact on your mental and physical health. Unsurprisingly, stress levels can also influence hormones that affect your eating habits, metabolism, and weight. With Calibrate’s approach to emotional health, you’ll learn how to incorporate science-backed methods to reduce stress and recognize emotional triggers that influence metabolic health.

How much weight can I lose in a week? Key takeaways

While most experts agree that it is safe to lose between 1-2 pounds per week, how many pounds you can or should lose within a given timeframe will vary widely depending on your age, sex, starting weight, underlying conditions, health history, and genetics. 

There’s no ideal number—and it's important to remember that weight loss is not always linear. You may see significant progress in the first few weeks, then hit a plateau as your body adjusts to the new habits. This is normal and expected, so it's important not to get discouraged. Instead, focus on making small changes and celebrating each victory along the way.

Calibrate members lose, on average, 15% of their body weight after completing their Metabolic Reset. Ready to get started? Find out if you’re eligible today.