
A liquid protein diet involves consuming only liquids or foods that turn into liquid at room or body temperature. This type of diet is usually recommended before a medical procedure or surgery to prepare or cleanse the body. It can also be followed after certain procedures, such as weight-loss surgery, to provide adequate nutrition during recovery. While on a liquid protein diet, it is important to ensure sufficient protein intake, which can be challenging. This can be achieved through protein shakes, nutritional shakes, and protein powder added to various liquids. Additionally, paying attention to portion sizes and including a variety of nutritionally dense foods is crucial. It is recommended to consult with a healthcare professional or registered dietitian to ensure that nutritional needs are met and to tailor the diet to specific requirements.
Characteristics and Values of a Liquid Protein Diet
| Characteristics | Values |
|---|---|
| Purpose | To provide sufficient nutrition without stressing the digestive tract, often before or after a medical procedure. |
| Food Consistency | Only liquids or foods that turn into liquid at room or body temperature are allowed. |
| Nutrition | Around 1500 calories and 45 grams of protein per day. |
| Meal Frequency | Several smaller meals throughout the day instead of large ones. |
| Food Variety | Six to seven different nutritionally dense foods are recommended. |
| Food Sources | Protein shakes, nutritional shakes, baby food, bone broth, soups, puddings, ice cream, etc. |
| Food to Avoid | Solid foods, raw or cooked fruits/vegetables with skin/seeds, acidic fruits/juices (for those with stomach surgery). |
| Considerations | Consult a healthcare professional or registered dietitian for guidance and to ensure nutritional needs are met. |
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What You'll Learn

Pureed baby food
A full liquid diet involves consuming only liquids or foods that turn into liquid at room temperature. This type of diet is usually recommended before a medical procedure, such as a colonoscopy, where it is important that your digestive tract is free of food residue. It is also sometimes recommended for people who have trouble swallowing or chewing.
A full liquid diet can provide enough energy, protein, and fat, but it may not provide enough fibre, vitamins, and minerals. Therefore, it is important to only follow this diet under a doctor's supervision. Your doctor may recommend that you take certain vitamins and supplements alongside the diet.
Puréed baby food can be a convenient option for a liquid diet. However, it is important to note that baby food does not come in large enough portions for adults and can be costly. When creating purées for babies, toddlers, or children, it is recommended to stick to foods they already enjoy.
- Pureed poultry (such as chicken or turkey) served with apple or pear sauce. Poultry is a good source of protein, B vitamins, zinc, and iron.
- Tofu blended with fruit puree. Tofu is a good source of plant-based protein, fibre, and healthy fats.
- Pureed fish (such as salmon, cod, trout, mackerel, or sea bass). Fish is a good source of protein and omega-3 fatty acids.
- Peanut butter stirred into a puree. Peanut butter is a good source of protein, vitamins, and minerals.
- Pureed vegetables such as sweet potato, cauliflower, or broccoli.
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Nutritional shakes
When choosing a nutritional shake, it's important to read the ingredient label and consider your specific needs and preferences. For example, if you're looking for a plant-based option, you might choose a shake containing pea or pumpkin seed protein. If you're concerned about added sugar, look for options with less than 7 grams. You can also find shakes that are high in fiber, supporting your gut health.
Some popular options for nutritional shakes include the OWYN Plant-Based Protein Shake, which comes in several flavours and has been recommended by health experts. Another option is the Koia Plant-Based Protein Shake, which is high in fiber. If you're looking for a shake with no added sugar, you might try Iconic Protein Drinks. For a chocolate flavour, Fairlife Core Power Protein Milk Shake is a good choice. For a shake with added collagen, you could try Revive Collagen Enhanced Plus, which also contains vitamins C, D, B12, and B6.
You can also make your own nutritional shakes at home by blending various ingredients. For example, you could use half a frozen sliced banana, a handful of frozen fruit, Greek yogurt, unflavoured protein powder, peanut butter, spinach or kale, and water. This combination results in a tasty shake with around 35 grams of protein per serving. Alternatively, you could add liquid pasteurized egg whites to your shake, as they are a good source of protein that doesn't need to be cooked.
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Bone broth
To make bone broth, you can use any animal bones and skin, but most broths are made from the leftovers of butcher's blocks. It is recommended to use bones from organic, pasture-raised animals, such as knuckles, joints, feet, and necks, as these are rich in collagen and cartilage.
The Bone Broth Diet is a 21-day diet plan that combines five days of a low-carb, paleo diet with two days of bone broth fasting per week. On non-fasting days, you can eat whole and minimally processed foods, including proteins, vegetables, fruits, and healthy fats. On fasting days, you can drink five to six 1-cup portions of bone broth, or five portions of bone broth followed by a protein-rich snack.
While bone broth is generally considered safe, there are some potential risks to be aware of, including lead contamination, bacterial contamination, and allergic reactions.
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Protein powder
A liquid diet involves consuming only liquids or foods that turn into liquids when you eat them. It is typically followed in the days or weeks before a medical test or surgery and can also be recommended for digestive disorders.
When choosing a protein powder, consider your dietary needs and preferences. For example, if you are on a weight-loss journey, opt for a low-calorie option. If you are an athlete or fitness enthusiast, look for a powder with maximum protein content and minimal fat and carbs. You can also find flavoured powders, such as orange and mango, which can make your drink more enjoyable.
In addition to drinks, protein powder can be used in other ways. For example, unflavoured protein powder can be added to soups to thicken them or included in dry ingredients when baking.
It is important to note that a full liquid diet may not provide all the essential nutrients your body needs. Therefore, it is recommended to consult a healthcare professional before starting a liquid diet to ensure it is safe and suitable for your individual needs.
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Smoothies
A liquid diet involves consuming only liquids or foods that turn into liquids when you eat them. It is important to note that liquid diets don't supply enough essential nutrients and should only be done under a doctor's supervision.
- Chocolate Cherry Smoothie: 12 oz water, milk, or yoghurt, 2 scoops chocolate-flavoured protein powder, 2 cups sweet dark cherries, 1 cup spinach, 1 tbsp walnuts, 1 tbsp ground flax, and 1 tbsp cacao nibs or dark cocoa powder.
- Strawberry Banana Smoothie: 12 oz water, milk, or yoghurt, 2 scoops vanilla or strawberry-flavoured protein powder, 1 banana, 1 cup frozen strawberries, 1 cup spinach, and 2 tbsp ground flax.
- PB&J Smoothie: Half a frozen sliced banana, a handful of frozen berries, about half a cup of Greek yoghurt, two scoops of unflavoured protein powder, a couple of spoonfuls of peanut butter, some spinach or kale, and water for liquid.
- Mango-Almond Smoothie: This smoothie bowl recipe includes frozen fruit, Greek yoghurt, spinach, and strawberries blended with almond butter.
- Anti-Inflammatory Smoothie: A blend of gut-friendly kefir, cherries, spinach, avocado, almond butter, and chia seeds.
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Frequently asked questions
A liquid protein diet involves consuming only liquids or foods that turn into liquid at room or body temperature. This type of diet is typically followed in the days or weeks before a medical test or surgery to prepare your body for the procedure.
You can eat any liquid foods or drinks on this diet. The best way to get protein is to sip fluids high in the nutrient, such as protein shakes or smoothies. You can also add protein powder to your morning coffee or make chia seed pudding with hemp seed milk and protein powder.
You should avoid any solid foods on a full-liquid protein diet. This means staying away from raw, cooked, or canned fruits or vegetables that have the skin or seeds. People who have had stomach surgery may also want to avoid consuming oranges and other acidic fruit and vegetable juices.
A liquid protein diet can be beneficial for those who have had bariatric surgery or are experiencing swallowing difficulties. It can also be used to prepare the body for a medical procedure, such as a colonoscopy, where it is important that the digestive tract is free of food residue.
Liquid protein diets do not supply enough important nutrients like fiber, so it is important to only follow this diet under a doctor's supervision. You may also need to take nutritional supplements if you are on a liquid protein diet for an extended period.











































