
The liver shrinking diet is a pre-operative diet that patients must follow before undergoing bariatric surgery. It is a low-calorie, low-carb, and low-fat diet that helps reduce liver size and weight. The exact number of calories recommended by doctors can vary, but it typically ranges from 450 to 1500 calories per day. This diet forces the body to use up its glycogen, lipid, and fat reserves, leading to a smaller liver and weight loss. The liver shrinking diet is crucial for ensuring the safety and success of the surgery, as an enlarged liver can complicate the procedure and increase the risk of bleeding.
Liver Shrinking Diet
| Characteristics | Values |
|---|---|
| Purpose | To reduce liver volume and weight before bariatric surgery |
| Calorie Intake | 450-1200 kcal per day |
| Carbohydrates | Low |
| Fats | Low |
| Protein | High |
| Duration | 2-12 weeks, typically 7-14 days |
| Food Options | Lean proteins like low-fat Greek yogurt, tuna, non-starchy carbs like broccoli, apples, rolled oats |
| Beverages | At least 64 oz of water and other approved beverages per day |
| Supplements | Multivitamins and minerals |
| Side Effects | Headaches, lightheadedness, constipation, change in menstrual cycle |
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What You'll Learn

Low-calorie, low-carb, and low-fat
A liver shrinkage diet is a low-calorie, low-carb, and low-fat diet that is recommended for patients undergoing weight loss (bariatric) surgery. The liver is the largest solid internal organ, making up about 2% of body weight. An enlarged liver can be caused by various conditions, including a diet high in fat, sugar, and salt. Before surgery, the liver must be reduced in size as a large liver can cause difficulties for the surgeon and slow down healing post-surgery.
The liver shrinking diet typically lasts for 7 to 14 days or anywhere between 2 to 12 weeks before the surgery. The diet is designed to reduce glycogen, water, and fatty deposits in the liver, making it smaller, softer, and more flexible. This is achieved by restricting calorie intake to between 800 and 1200 calories per day, with a focus on consuming lean proteins like low-fat Greek yogurt or tuna, and non-starchy carbohydrates like broccoli, apples, or rolled oats. Alcohol, sugary drinks, and full-fat dairy are prohibited. Portion sizes are small, with typically three servings of carbohydrates, two servings of fruit, two servings of protein, two servings of milk, and three to five servings of vegetables allowed per day.
It is important to stay hydrated on this diet, drinking at least 64 ounces of sugar-free, calorie-free beverages per day, with water being the best choice. Additionally, supplementing with a multivitamin can help prevent nutritional deficiencies. The liver shrinking diet is restrictive, so it is important to eat all your portions and prepare your meals in advance to stick to the diet.
One option for the liver shrinking diet is to have four 325 ml (approximately 11 ounces) premade Slimfast protein meal replacement shakes along with two servings of non-starchy vegetables per day. Another option includes more solid foods, with a breakfast of one carbohydrate and one dairy portion, and a lunch of two proteins and two vegetable portions. It is important to follow the specific recommendations provided by your doctor and discuss any concerns with them or a dietician.
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High-protein foods
A liver shrinking diet is a pre-operative diet that patients must follow before undergoing bariatric surgery. It is designed to reduce the size of the liver and lower weight and liver volume. The diet is low in calories, carbohydrates, and fats but high in protein. The exact number of calories recommended by doctors may vary, ranging from 450 to 1500 calories per day. However, a typical liver shrinking diet restricts calorie intake to between 800 and 1200 calories.
Meat and Dairy
Meat and dairy products are excellent sources of protein. Lean meats, such as chicken, and low-fat dairy, like Greek yogurt, are ideal choices. These foods provide essential amino acids that contribute to muscle growth and maintenance.
Eggs
Eggs are a versatile and nutritious source of protein. They can be prepared in a variety of ways and are easily incorporated into meals or snacks.
Fish
Fish, particularly tuna, is a great option for high-protein content. It is also a good source of healthy fats, such as omega-3 fatty acids, which have anti-inflammatory properties.
Legumes
Legumes, including lentils, chickpeas, soybeans, and peas, are not only high in protein but also offer nutritional density and resistant starches that promote gut health. Legumes have been associated with lower blood glucose and triglyceride levels, reducing the likelihood of non-alcoholic fatty liver disease (NAFLD).
Tofu
For those looking to limit fat consumption, tofu is an excellent choice. It is a low-fat food that provides a good amount of protein and can be used in a variety of dishes.
Protein Shakes and Supplements
Protein shakes and supplements are a convenient way to increase protein intake. Look for options that contain at least 20 to 25 grams of protein, fewer than 200 calories, less than five grams of sugar, and 15 grams or fewer carbohydrates. These can be mixed with unsweetened milk alternatives or water.
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Multivitamins and supplements
A liver shrinking diet is typically followed before undergoing bariatric surgery. It is a low-calorie, low-carb, and low-fat diet that helps reduce the size of the liver and ensure the procedure goes smoothly. The exact number of calories recommended by doctors may vary, but it is usually restricted to 800-1200 calories per day.
It is important to consult your doctor or nutritionist before taking any multivitamins or supplements. They will be able to advise you on what is suitable for your specific needs and dietary requirements.
Some general recommendations for multivitamins and supplements to take while on a liver shrinking diet include:
- Multivitamins: A multivitamin can help prevent nutritional deficiencies that may be caused by a restrictive diet.
- Vitamin B1 and B2: These vitamins are important for overall health and may be included in most multivitamins.
- Vitamin A: This vitamin can be beneficial, but there is a fine line between a healthy amount and an excess. Too much vitamin A can be harmful to your liver.
- Vitamin C: This supplement can be taken unless you have hemochromatosis.
- Vitamin D and K: If you have jaundice, you may be deficient in these vitamins and may need special replacement.
- Magnesium: Your doctor may recommend a blood test to check your magnesium levels. If you are deficient, a supplement may be ordered.
- Iron: Iron is important to prevent anemia and can be found in liver or taken as a supplement. However, if you have hemochromatosis, iron supplements should be avoided.
- Protein shakes: Shakes are a great way to get your protein while on a restrictive diet. Look for shakes with low calories, sugar, and carbohydrates, and high protein content.
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Portion sizes
The liver shrinking diet is a low-calorie, low-carb, and low-fat diet that is often prescribed before bariatric surgery to reduce weight and liver volume. The diet typically lasts for 2 to 12 weeks, with a median of 6 weeks. The exact timeframe will depend on your unique situation and dietary needs, and your doctor will advise you on the best course of action.
The diet typically restricts calorie intake to between 800 and 1200 calories per day, although the exact number of calories recommended by doctors can vary. It is important to follow the specific recommendations provided by your doctor or dietician.
The liver shrinking diet is designed to help reduce the size of your liver, making it easier for surgeons to access the stomach during weight loss surgery. A large, fatty liver can increase the duration of surgery and the time spent under general anaesthetic. It can also be dangerous, as the liver could bleed heavily or other organs could be injured.
In addition to portion sizes, there are several other things to keep in mind when following a liver shrinking diet. It is important to stay hydrated, drinking at least 64 ounces of sugar-free, calorie-free beverages per day. You should also take a multivitamin to prevent any nutritional deficiencies caused by the restrictive diet. Finally, it is crucial to strictly follow the diet plan provided by your doctor or dietician to ensure the safety and success of your surgery.
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Timing of the diet
The timing of a liver shrinking diet depends on the patient's unique situation and dietary needs. The diet is typically recommended before weight loss or bariatric surgery, and the timeframe can range from 2 to 12 weeks. In one study, the median amount of time individuals started the diet before surgery was 6 weeks.
The liver shrinking diet is designed to reduce the size of the liver and promote weight loss. It is a low-calorie, low-carbohydrate, and low-fat diet that can help reduce liver volume and weight before surgery, making the procedure safer and reducing the risk of complications.
The exact timeframe for starting the diet will depend on the patient's body mass index (BMI) and other individual factors. It is important to follow the recommendations provided by a doctor or dietician, as the diet should be tailored to the patient's specific needs.
The liver shrinking diet is typically followed for a short period, ranging from 7 to 14 days up to a few weeks before surgery. It is important to note that the diet should not be started too far in advance, as it is meant to be a short-term measure to prepare for surgery.
During the liver shrinking diet, it is recommended to consume lean proteins such as low-fat Greek yogurt or tuna, and non-starchy carbohydrates like broccoli, apples, or rolled oats. Alcohol, sugary drinks, and full-fat dairy are strictly prohibited. It is also important to stay hydrated by drinking at least 64 ounces of sugar-free and calorie-free beverages per day.
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Frequently asked questions
A liver shrinking diet is a low-calorie, low-carb, and low-fat diet that is followed before bariatric surgery. It helps reduce liver volume and weight, making the surgery safer and less challenging.
The exact number of calories can vary, but it typically ranges from 450 to 1500 calories per day. Some sources suggest a more specific range of 800 to 1200 calories.
Foods that are typically included are lean proteins like low-fat Greek yogurt, tuna, and non-starchy carbohydrates like broccoli, apples, and rolled oats. Protein shakes and meal replacement products like Slimfast are also commonly used.
The duration of the diet depends on individual needs, but it typically ranges from 2 to 12 weeks, with a median of 6 weeks. Some sources suggest a shorter duration of 7 to 14 days.
Yes, it is important to follow the specific recommendations provided by your doctor or dietician. Side effects may include headaches, feeling light-headed, and constipation due to low fibre intake. It is also recommended to take a multivitamin and mineral supplement to prevent nutritional deficiencies.











































