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He says trying to do too much too quickly can be overwhelming, and many people quit when they feel that way. Instead, Singh says to make small but permanent changes toward your goal.

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Medically Reviewed. Lynn Grieger, RDN, CDCES. Losing more than that is considered too fast and could put you at risk of many health problems, including muscle loss, gallstones, nutritional deficiencies and a drop in metabolism 4 , 6 , 7 , 8. People often prefer the option of eating a very low-calorie diet, since it is often easier to lose weight through diet than exercise 9.

For this initial period, fast weight loss is perfectly normal. When you consume fewer calories than your body burns, your body starts dipping into its stores of energy, known as glycogen.

This is why you might experience a major drop in weight during your first week. Once your body uses up its glycogen stores, your weight loss should stabilize at 1—2 pounds 0.

Summary: According to experts, losing 1—2 pounds 0. However, you may lose more than that during your first week of an exercise or diet plan.

Most studies show that people who lose weight at a slow but steady pace are more likely to keep it off long-term 15 , 16 , Also, plans that encourage slow weight loss usually help you build healthy eating behaviors like eating more fruits and veggies and drinking fewer sugar-sweetened beverages.

Behaviors like these can help you keep weight off long-term 18 , 19 , 20 , However, several studies have found that rapid weight loss may be just as effective as slow weight loss, even for the long term 4 , 5. In one study, people followed a rapid weight loss diet for 12 weeks, while 97 people followed a slow but steady weight loss diet for 36 weeks.

This means that both diets were equally effective in the end People in the rapid weight loss groups had support from doctors and dietitians during the weight loss and weight maintenance phases. Research shows that having support from a health professional can improve your chances of long-term weight loss success 23 , Also, doctors and dietitians try to minimize the health risks that come with eating very few calories.

These risks include muscle loss, nutritional deficiencies and gallstones. In short, you are more likely to lose weight and keep it off by losing weight slowly.

Summary: Most research shows that gradual weight loss is easier to maintain over the long-term. It helps you develop healthy eating behaviors and has fewer health risks than fast weight loss. Diets that promote rapid weight loss are often very low in calories and nutrients.

This may put you at risk of many health problems, especially if you follow a rapid weight loss diet for many weeks. Losing weight is not always the same as losing fat. While a very low-calorie diet may help you lose weight fast, a lot of the weight you lose may come from muscle and water 4 , In one study, researchers put 25 people on a very low-calorie diet of calories per day for 5 weeks.

They also put 22 people on a low-calorie diet of 1, calories per day for 12 weeks. After the study, the researchers found that both groups had lost similar amounts of weight.

However, the people who followed the very low-calorie diet lost over six times as much muscle as those on the low-calorie diet 4. Your metabolism determines how many calories you burn each day. A slower metabolism means you burn fewer calories per day Two reasons why the metabolism drops on a very low-calorie diet are a loss of muscle and a fall in hormones that regulate your metabolism, such as thyroid hormone 27 , Unfortunately, this drop in metabolism may last long after you finish dieting 6.

When these stores get used up, the body uses up muscles. As a result, there is more muscle loss than fat. It is also challenging to maintain fast weight loss and quickly slide back into the old lifestyle and eating habits.

It can also lead to the development of eating disorders. You can lose weight by various methods. But the real challenge is maintaining the lost weight and keeping it off. They also have higher chances of retrieving all the weight they have lost after years. Losing weight and losing fat are two very different things.

Losing weight may not always be the same as losing fat. Although following a very low-calorie diet VLCD helps you lose weight fast, it can result from muscle and water loss.

According to research , following a very low-calorie diet can deplete body mass. Furthermore, following a VLCD comes with some risks like muscle loss. Your metabolic activity plays an essential role in weight loss.

Your metabolism determines how many calories you burn each day. In addition, metabolism helps convert the food you consume into energy.

Therefore, having a fast metabolism helps burn more calories, resulting in quick weight loss. That is because your body experiences a drop in metabolic rate. It may result from a change in hormonal balance. Furthermore, a reduced metabolic rate will result in weight regain.

Usually, people trying to lose drastic weight tend to skip meals, which causes nutrient deficiencies. While on a low-calorie diet, consuming essential nutrients like folate, B12, and iron can be very hard. A deficiency of essential nutrients causes fatigue, hair loss, anaemia, weakened bones, and poor immune function.

Therefore, you should add more unprocessed, raw foods to fulfil these deficiencies. You will also have to add supplements to your diet in severe conditions. Gallstones are stone-like formations that develop due to undissolved cholesterol in the gallbladder.

They can cause severe pain and cramps in the abdomen. According to research , losing weight drastically and rapidly can be a leading cause of gallstone formation.

The gallbladder aids in the digestion of fatty foods. When you are not eating enough food, these digestive juices form gallstones. Rapid weight loss is usually a result of reducing water weight or water loss.

According to research , following diets that help reduce weight rapidly can lead to severe dehydration. It will cause symptoms like:. The human body continuously adapts to minor changes to operating smoothly.

Electrolytes play a significant role in running bodily functions. They help the muscles contract and relax and also regulate heartbeats. Sudden changes in the diet can affect mineral intake, disturbing the electrolytes. It may lead to cardiovascular irregularities and put other organs at risk.

However, the heart is at significant risk. Therefore, an electrolyte imbalance due to drastic weight loss increases a heart attack risk.

Following a crash diet can help you lose weight pretty quickly. But the extreme calorie deficit makes it difficult for the body to function normally. It can cause severe fatigue. As a result, it may increase the risk of fainting under minimum stress.

Other symptoms include:. It might also force you to go back to the original diet. As a result, you will find it challenging to maintain the lost weight. Some people lose weight intentionally for better health. However, there can be many reasons for drastic weight loss.

Some of these factors will make you lose weight without trying. Some causes are:. Having an eating disorder can lead to drastic weight loss. Anorexia and Bulimia are two such eating disorders.

People with these disorders obsess over the idea of having a model-like figure. Therefore, they take extreme measures to lose weight. However, it may lead to complications like vomiting or passing stools after a meal. It leads to drastic weight loss, but it is unhealthy.

Underlying health conditions are also a cause of drastic weight loss. For example, tuberculosis, HIV infection, and kidney diseases cause sudden weight loss. Therefore, it is essential to get regular checkups. It is also vital to follow a healthy diet. Consult a doctor and follow the prescribed treatment if you have such conditions.

Having a disturbed metabolism also results in drastic weight loss. People with hyperthyroidism usually experience this. It is essential to consult a doctor in case of such issues. Also, follow the prescribed doses of medications.

Changes in quantities can also cause weight loss. Sorry something went wrong with your subscription Please, try again in a couple of minutes Retry. Show references AskMayoExpert. Abnormal weight loss. Mayo Clinic; Involuntary weight loss. Merck Manual Professional Version.

Accessed May 25, Ferri FF. Unexplained weight loss. In: Ferri's Clinical Advisor Elsevier; Gupta R, et al. Approach to the patient with unintentional weight loss. Gaddey HL, et al. Unintentional weight loss in older adults. American Family Physician. Perera LAM, et al.

Approach to patients with unintended weight loss. Medical Clinics of North America. Takahashi PY expert opinion. Mayo Clinic. June 9, See also 6 tips to manage rheumatoid arthritis symptoms Acanthosis nigricans Addison's disease Adjuvant therapy for cancer Adrenal fatigue: What causes it?

Alcoholic hepatitis Amputation and diabetes Amyloidosis Angina Anorexia nervosa Antidepressant withdrawal: Is there such a thing? Antidepressants and alcohol: What's the concern?

Antidepressants and weight gain: What causes it? Antidepressants: Can they stop working? Antidepressants for children and teens Antidepressants: Side effects Antidepressants: Selecting one that's right for you Antidepressants: Which cause the fewest sexual side effects?

Artificial sweeteners: Any effect on blood sugar? Ascariasis Aspergillosis Atypical antidepressants Atypical cells: Are they cancer? Bile reflux Binge-eating disorder Biopsy procedures Blood glucose meters Blood glucose monitors Blood sugar levels can fluctuate for many reasons Blood sugar testing: Why, when and how Bone and joint problems associated with diabetes Bone cancer Dr.

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Depression and anxiety: Can I have both? Depression, anxiety and exercise What is depression? A Mayo Clinic expert explains. Depression in women: Understanding the gender gap Depression major depressive disorder Depression: Supporting a family member or friend Dermatomyositis Diabetes Diabetes and depression: Coping with the two conditions Diabetes and exercise: When to monitor your blood sugar Diabetes and heat What is type 1 diabetes?

A Mayo Clinic expert explains 10 ways to avoid diabetes complications Diabetes diet: Should I avoid sweet fruits? Diabetes diet: Create your healthy-eating plan Diabetes foods: Can I substitute honey for sugar?

Diabetes and liver Diabetes insipidus Diabetes management: How lifestyle, daily routine affect blood sugar Diabetes prevention: 5 tips for taking control Type 1 diabetes FAQs Diabetes symptoms Diabetes treatment: Can cinnamon lower blood sugar? Medications for type 2 diabetes Using insulin Diabetic Gastroparesis Diabetic neuropathy Diabetic neuropathy and dietary supplements Types of diabetic neuropathy Cancer-related diarrhea Does stress make rheumatoid arthritis worse?

Drug addiction substance use disorder Dysphagia Early HIV symptoms: What are they? Ease rheumatoid arthritis pain when grocery shopping Eating during cancer treatment: Tips to make food tastier Esophageal cancer Esophageal Cancer Ewing sarcoma Fibromuscular dysplasia Floor of the mouth cancer Gallbladder cancer Gallbladder polyps: Can they be cancerous?

Gastroparesis GI Stents Giant cell arteritis Giardia infection giardiasis GLP-1 agonists: Diabetes drugs and weight loss Glycemic index: A helpful tool for diabetes? Granulomatosis with polyangiitis Graves' disease Helicobacter pylori H. pylori infection Hairy cell leukemia Heart cancer: Is there such a thing?

Sticking to a very low calorie diet long-term can also lead to nutritional deficiencies. Your body needs certain nutrients for optimal function. This can lead to numerous other issues. For example, research has linked deficiencies in iron, copper, and zinc with hair loss.

Deficiencies can also lead to poorer gut health. Gut health is important for the brain while also helping to protect against chronic disease. So, the effects of too quick weight loss are many and can change depending on what your diet looks like and how long you stick to this type of plan.

This requires employing sustainable weight loss strategies consistent with a healthy lifestyle. Here are a few to consider:. Eat enough calories to meet your nutritional needs. If you or your client are not sure what these needs are, working with a nutritionist can help. Certain people have different nutritional requirements.

They can change when pregnant or breastfeeding, for instance. They also change based on the stage of life, with some varying quite drastically based on whether the person is a teen, adult, or older adult. Consume foods from each food group. One common theme among quick weight loss diets is that many omit entire categories of food.

This is how deficiencies can start to form. Your diet should include carbs, protein, and fat. The key is to choose healthy versions of each. For instance, sources of healthy fat include avocado, olive oil, nuts, and seeds. Whole grains and fruit are healthy carbs while lean meats, fish, and eggs are each a source of healthy protein.

Choose natural over processed foods. Some diet plans consist primarily of pre-packaged or processed foods. This means that they contain other substances that might not be good for your health—even if they are within the dietary guidelines.

Natural food sources are best. Develop healthy eating habits. Do you tend to eat while standing at the cupboard or refrigerator? Are you usually the first one done with your meal? Making small changes to eating habits such as these can help with weight loss. Avoid fad or crash diets.

Remember that these diet types are intended to be short-term. What happens when you go off them? Weight gain sets in. You want to make changes to your diet that you can stick with for the long haul. You should also work with your healthcare provider if losing weight fast might offer more benefits than harm.

If you are having trouble controlling your blood sugar, for instance, getting some extra weight off may help improve this control.

When you drastically reduce calories, even if you need to lose weight, your body thinks you are starving. As a protective mechanism, your body slows your metabolism — but this makes it harder to keep losing weight.

It also means that when you start adding more calories, you can regain weight very quickly. Many people will find they regain faster than they lost after this kind of drastic diet.

Other possible side effects from very rapid weight-loss include electrolyte imbalances, abnormal heart rate and rhythm, low blood sugar, dehydration, acute gout, hair loss, weakness, constipation and more.

Medically supervised diets can provide the appropriate safety measures to protect you while you lose weight, monitor your health for side effects, and help to assure your safety. If you are thinking of attempting rapid weight-loss on your own, it is important to consider the possible risks and talk to your doctor if you have any health conditions.

About the Author Dr. Jacques is currently the Vice President of Research and Development for Thorne Research, a company dedicated to enhancing health by providing the highest standards in quality and purity in therapeutic supplements for three decades.

Her greatest love is empowering patients to better their own health. Jacques is a member of the OAC National Board of Directors.

Help the OAC to raise awareness, advocate for improved access, provide evidence-based education, fight to eliminate weight bias and discrimination and elevate the conversation of weight and its impact on health.

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Articles Brochures Guides 4. Videos Additional Categories. Fact Sheets. Back to Library The Risks of the Crash Diet. Download PDF. Your health care provider may order blood and urine tests that can give information about your general health. You may have other tests based on these results.

Imaging scans to look for hidden cancers are not usually done unless some other clue in addition to weight loss points in that direction.

Sometimes, if the basic evaluation does not identify a cause, watchful waiting for 1 to 6 months is a reasonable next step. Your health care provider may suggest that you stop any restrictive dieting. You may need a special diet to prevent further weight loss or to regain lost pounds.

Your provider can refer you to a dietitian who can offer suggestions on getting enough calories. There is a problem with information submitted for this request. Sign up for free and stay up to date on research advancements, health tips, current health topics, and expertise on managing health.

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Show references AskMayoExpert. Abnormal weight loss. Mayo Clinic; Involuntary weight loss. Merck Manual Professional Version. Accessed May 25, Ferri FF. Unexplained weight loss.

In: Ferri's Clinical Advisor Elsevier; Gupta R, et al. Approach to the patient with unintentional weight loss. Gaddey HL, et al. Unintentional weight loss in older adults.

American Family Physician. Perera LAM, et al. Approach to patients with unintended weight loss. Medical Clinics of North America. Takahashi PY expert opinion.

Mayo Clinic. June 9, See also 6 tips to manage rheumatoid arthritis symptoms Acanthosis nigricans Addison's disease Adjuvant therapy for cancer Adrenal fatigue: What causes it?

Alcoholic hepatitis Amputation and diabetes Amyloidosis Angina Anorexia nervosa Antidepressant withdrawal: Is there such a thing? Antidepressants and alcohol: What's the concern?

Antidepressants and weight gain: What causes it? Antidepressants: Can they stop working? Antidepressants for children and teens Antidepressants: Side effects Antidepressants: Selecting one that's right for you Antidepressants: Which cause the fewest sexual side effects?

Artificial sweeteners: Any effect on blood sugar? Ascariasis Aspergillosis Atypical antidepressants Atypical cells: Are they cancer? Bile reflux Binge-eating disorder Biopsy procedures Blood glucose meters Blood glucose monitors Blood sugar levels can fluctuate for many reasons Blood sugar testing: Why, when and how Bone and joint problems associated with diabetes Bone cancer Dr.

Wallace Video Dr. Mark Truty surgery, MN better outcomes with chemo C. difficile infection Caffeine: Does it affect blood sugar? Cancer Cancer Cancer blood tests Myths about cancer causes Infographic: Cancer Clinical Trials Offer Many Benefits Cancer diagnosis: 11 tips for coping Cancer-related fatigue Cancer pain: Relief is possible Cancer risk: What the numbers mean Cancer surgery Cancer survival rate Cancer survivors: Care for your body after treatment Cancer survivors: Late effects of cancer treatment Cancer survivors: Managing your emotions after cancer treatment Cancer treatment myths Carcinoid tumors Castleman disease Celiac disease Chemotherapy side effects: A cause of heart disease?

Chronic lymphocytic leukemia Chronic myelogenous leukemia Churg-Strauss syndrome Cirrhosis What is cirrhosis? A Mayo Clinic expert explains Cirrhosis FAQs Clinical depression: What does that mean? Colon cancer Colon Cancer Family Registry Colon cancer screening: At what age can you stop?

Colon cancer screening Colorectal Cancer Congenital adrenal hyperplasia Coronary artery spasm: Cause for concern? Crohn's Crisis Crohn's disease Crohn's disease and the gut microbiome What is Crohn's disease? A Mayo Clinic expert explains Crohn's or Colitis Curcumin: Can it slow cancer growth?

Depression and anxiety: Can I have both? Depression, anxiety and exercise What is depression? A Mayo Clinic expert explains. Depression in women: Understanding the gender gap Depression major depressive disorder Depression: Supporting a family member or friend Dermatomyositis Diabetes Diabetes and depression: Coping with the two conditions Diabetes and exercise: When to monitor your blood sugar Diabetes and heat What is type 1 diabetes?

A Mayo Clinic expert explains 10 ways to avoid diabetes complications Diabetes diet: Should I avoid sweet fruits? Diabetes diet: Create your healthy-eating plan Diabetes foods: Can I substitute honey for sugar?

Diabetes and liver Diabetes insipidus Diabetes management: How lifestyle, daily routine affect blood sugar Diabetes prevention: 5 tips for taking control Type 1 diabetes FAQs Diabetes symptoms Diabetes treatment: Can cinnamon lower blood sugar?

Medications for type 2 diabetes Using insulin Diabetic Gastroparesis Diabetic neuropathy Diabetic neuropathy and dietary supplements Types of diabetic neuropathy Cancer-related diarrhea Does stress make rheumatoid arthritis worse?

Drug addiction substance use disorder Dysphagia Early HIV symptoms: What are they? Ease rheumatoid arthritis pain when grocery shopping Eating during cancer treatment: Tips to make food tastier Esophageal cancer Esophageal Cancer Ewing sarcoma Fibromuscular dysplasia Floor of the mouth cancer Gallbladder cancer Gallbladder polyps: Can they be cancerous?