Drink Up, Slim Down? The Pros & Cons of a Liquid Diet (2024)

One of the many weight loss tricks these days is a liquid diet. The goal is to lower your daily caloric intake by consuming nothing but liquids for one or all of your meals. Over-the-counter weight loss drinks are available for anyone to buy or you can work with your doctor using a medically supervised liquid diet plan. Made popular by Slim Fast, Medifast, Slender Now Thick Shake, HMR, and Optifast, liquid diets claim to provide all the nutrition you need in delicious, filling shakes.

Can you really drink your way thin? Does this sound too good to be true? Read on to find out.

Does a Liquid Diet Work?Drink Up, Slim Down? The Pros & Cons of a Liquid Diet (1)

Weight loss occurs when you burn more calories than you consume. So if you eat and drink fewer calories, you’ll lose weight. Liquid diets play off this formula by drastically reducing the number of calories in your diet. Many liquid diet plans start out at only 400 to 800 calories a day. Replacing meals with high protein shakes eliminates excess calories and fat from your diet and leads to weight loss. When you reduce calories and remove the option of food, you can expect to lose three to four pounds a week.

The route of going liquid isn’t for everyone. You’ve got to be motivated and disciplined to stick with it. As with any diet, the more overweight you are, the more weight you can expect to lose.

Will It Last?

One of the downsides of liquid diets is the slim chance that you’ll be able to keep the weight off long-term. Along with an initial weight loss, a drastic reduction of calories will slow your metabolism, as it forces your body into starvation mode. When this happens, your body holds onto as many calories as possible to conserve energy. Stop your liquid diet and return to eating normal amounts of food, and you can expect to regain all your lost weight. In fact, a depressing 95 percent of people who lose weight with a liquid diet can expect to gain it back.

Dieters will have the most success at keeping weight off long term if they eat some meals liquid and some meals with food. Studies have shown that the liquid diets that are most successful are those that combine meal replacement shakes with regular exercise and classes on lifestyle modifications and weight loss support.

These results aren’t just for liquid diets, but for all diets. There are multiple ways to effectively lose weight, but if you don’t make a long-term change in your eating habits and lifestyle, you can expect to gain the weight back.

Is It Safe?Drink Up, Slim Down? The Pros & Cons of a Liquid Diet (2)

Restricting calories to as few as 400 a day can be dangerous for your health. Those who plan to go this route should be supervised by a medical professional. Remember—too few calories means not enough nutrients. Without adequate nutrition, you may experience dizziness, fatigue, hair loss, electrolyte imbalance, gallstones, constipation, anemia, menstrual problems, loss of muscle mass, and even heart damage. So make sure you’re getting enough calories for energy and nutrition to avoid serious long-term consequences. Also, if you’re pregnant or nursing or have diabetes, you should never go on a liquid diet.

Before beginning a liquid diet, speak with your doctor. Choose a plan that lets you eat one or two normal meals a day and that coaches you along the way with healthy lifestyle habits. Make sure your shakes contain 100 percent of the recommended vitamins and minerals you need. Follow the directions of your liquid diet plan, and aim to lose weight gradually over a 12-week time frame.

If you decide a liquid diet is the best way for you to lose weight, be smart while on it. Approach it as a short-term approach for quick weight loss that jump-starts your healthy lifestyle—not a long-term approach to keeping the pounds off.

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Drink Up, Slim Down? The Pros & Cons of a Liquid Diet (3)

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Drink Up, Slim Down? The Pros & Cons of a Liquid Diet (2024)

FAQs

What are the pros and cons of a liquid diet? ›

A clear liquid diet is easy for the body to digest but has little nutritional value, so it is not safe for weight loss. However, doctors may prescribe it before certain surgeries and medical procedures or as a temporary remedy for gastrointestinal distress.

What are the side effects of the liquid diet? ›

It is normal to feel nauseous, have a headache or become irritable during the first 48-72 hours of your liquid diet. These bad feelings will pass as your body gets used to the diet. It is also normal to have loose stools and need to use the restroom frequently during the liquid diet.

How much weight can I lose in 2 weeks on a liquid diet? ›

Many liquid diet plans start out at only 400 to 800 calories a day. Replacing meals with high protein shakes eliminates excess calories and fat from your diet and leads to weight loss. When you reduce calories and remove the option of food, you can expect to lose three to four pounds a week.

Does liquid diet reduce belly fat? ›

While a liquid diet may result in a temporary decrease in overall weight , it may not necessarily lead to a reduction in belly fat . This is because liquid diets often lack essential nutrients and can cause the body to go into starvation mode , slowing down metabolism and leading to the preservation of fat stores .

What are the disadvantages of liquid food? ›

1. Liquid diets may lack essential nutrients leading to deficiencies in vitamins, minerals, and other crucial elements. 2. It can contribute to muscle loss because of inadequate protein intake which may have negative implications for overall health.

Who should not do liquid diet? ›

Liquid Diet Risks

Missing out on essential nutrients can lead to side effects such as fatigue, dizziness, hair loss, gallstones, and heart damage. Also, if you don't get enough fiber, because you're not eating whole grains, fruits and vegetables, you can get constipated.

Do you still poop on a liquid diet? ›

You might also have frequent, loose stools on a full liquid diet simply because you are not consuming solids. As you begin to return to a solid food diet, your bowel movements should improve.

What does a liquid diet do to your stomach? ›

The clear liquid diet is not very exciting. But it's designed to keep your stomach and intestines clear. It also limits strain on your digestive system while giving your body enough fluid.

What is the risk of a full liquid diet? ›

Risks. It is very difficult to get enough nutrients on a full liquid diet, especially long term. Liquid diets are typically low in vitamin A, iron, vitamin B-12, and thiamine. People who must eat a full liquid diet for extended periods may need to take supplements to prevent nutritional deficits.

How long can you safely stay on a liquid diet? ›

Nutrition. A clear liquid diet is not adequate in calories and nutrients. It should not be followed for more than five days unless supplemented by high-protein gelatin or other low residue supplements.

Can you lose 10 pounds in 3 days liquid diet? ›

The 3-Day Diet claims dieters can lose up to 10 pounds in three days. Weight loss is possible on The 3 Day Diet, but only because it is very low in calories. And realistically, most of that weight is likely water weight and not fat loss because the diet is so low in carbohydrates.

How to get a flat tummy fast naturally? ›

The following sections look at specific ways to help get rid of belly fat.
  1. Focus on low calorie foods. ...
  2. Eliminate sugary drinks. ...
  3. Eat fewer refined carbs. ...
  4. Eat more fruits and vegetables. ...
  5. Go for lean proteins. ...
  6. Choose healthful fats. ...
  7. Develop a workout. ...
  8. Boost overall activity.

How to lose 10 pounds in a week? ›

To lose 10 pounds in one week, you'll need to burn between 3,500 and 5,000 calories more than you consume each day by restricting your diet to small portions of nutritious yet low-calorie foods, and significantly increasing your aerobic exercise with interval training, sports, and other vigorous activities.

Are scrambled eggs on a full liquid diet? ›

Milk may be used in beverages such as eggnog*, milkshakes, malted milk, high protein milk and in cream soups. Eggs and Cheese * Do not use raw eggs, use custard, soft custard, or a commercial egg mixture that is pasteurized.

What are the disadvantages of a clear liquid diet? ›

Problems With Clear Liquid Diet
  • Hunger.
  • Nausea.
  • Vomiting.
  • Abdominal discomfort or pain.
Sep 30, 2022

What are the cons of the water diet? ›

Water fasting can increase levels of uric acid as well, which is harmful for those with kidney disease and gout, says Galej. Additionally, keep in mind that prolonged fasting periods (ranging from around 24 hours to 72 hours) can be dangerous if done without medical supervision.

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