Leena Watts
Thickened liquid diets are a medical dietary adjustment for people with dysphagia, a condition that makes it difficult to swallow thin liquids. This condition can be caused by a neurological issue, such as a stroke, or by a weakening of the muscles or nerves of the oesophagus. Thickened liquids prevent choking and aspiration by slowing down the speed at which liquids flow down the throat, making them easier to control. The thickness of liquids can vary from mildly thickened liquids with a nectar-like consistency to extremely thickened liquids with a pudding-like consistency.
| Characteristics | Values |
|---|---|
| Who should follow | People with difficulty swallowing (dysphagia) |
| Purpose | To prevent choking and aspiration |
| Examples of thin liquids | Water, milk, soda, coffee, juice, soup broth |
| Examples of naturally thicker liquids | Buttermilk |
| Consistency | Nectar-like, honey-like, spoon-thick |
| How to thicken | Powders, gels, commercial thickening products |
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What You'll Learn
Thickened liquids prevent choking and aspiration
Thickened liquids are a medical dietary adjustment for people who have difficulty swallowing, a condition known as dysphagia. Dysphagia is a serious health issue, with a prevalence of 7-22% in older individuals, and it is reported that over 80% of patients with Parkinson's disease suffer from it. The condition is also associated with an increased risk of aspiration pneumonia.
Dysphagia is characterised by trouble chewing or swallowing, and in some cases, food or liquid enters the airway. Thin liquids such as water, milk, coffee, and juice flow down the throat quickly and can be unsafe for people with dysphagia. They pose the greatest risk for choking and aspiration.
Thickened liquids help prevent choking and aspiration by slowing down the flow of liquids down the throat, making them easier to control and safer to swallow. The thicker consistency is achieved by adding a thickening agent, such as xanthan gum, which is odourless and flavourless. There are different levels of thickness, ranging from mildly thickened liquids with a nectar-like consistency to extremely thickened liquids with a pudding-like consistency. The required thickness level is determined by the severity of dysphagia, and a speech-language pathologist can assess and advise on the appropriate level.
By increasing the viscosity of liquids, the risk of choking and aspiration is reduced. This is particularly important for individuals with neurological conditions, such as a stroke, or those with weakened muscles or nerves in the oesophagus. Thickened liquids give the tongue more time to control the liquid in the mouth before swallowing, further reducing the risk of choking.
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Liquids are thickened with powders, gels or commercial thickeners
Thickened liquids are often consumed by individuals who have difficulty swallowing (a condition known as dysphagia) to prevent choking and reduce the risk of aspiration. Liquids that are naturally thin, such as water, coffee, milk, soda, and broth, can be thickened with powders or gels.
There are several types of thickening agents available, including commercial thickeners, powders, and gels. Commercial thickeners are available in the form of pre-thickened drinks or thickening products that can be mixed with liquids. These thickeners come in starch-based and gum-based varieties, each with its own advantages and disadvantages. Powders, such as cornstarch, are commonly used to thicken liquids and are mixed with water or juice. When cornstarch is cooked in water, it absorbs water, swells, and ruptures, forming a thickened mixture through a process called gelatinization. Pre-gelatinized starches, such as waxy maize starch, can also be used to create a clearer, more fluid mixture.
Other thickening agents include gelling agents, which form a gel and dissolve in the liquid phase, creating a weakly cohesive internal structure. Vegetable gums, such as pectin from citrus peel, guar gum from guar beans, and locust bean gum from carob beans, are commonly used gelling agents. These natural gums are polysaccharides that can be extracted from plants or secreted by bacteria. For example, xanthan gum is produced by the bacterium Xanthomonas campestris.
Additionally, proteins such as collagen, egg whites, and gelatin can also act as thickening agents. Some thickening agents, like sodium pyrophosphate, interact with proteins already present in food. For instance, sodium pyrophosphate acts on casein in milk during the preparation of instant pudding.
The choice of thickening agent depends on various factors, including the desired consistency, taste preferences, and the specific properties of the liquid being thickened. It is important to note that some liquids cannot be thickened, such as those that are thin at room temperature. Consulting with a healthcare professional, such as a speech language pathologist, can provide guidance on the appropriate thickness level and suitable thickening agents for an individual's specific needs.
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Thickened liquids are recommended for people with dysphagia
Thickened liquids are a dietary adjustment that increases the consistency of fluids, making them slower to swallow. This helps individuals with dysphagia, or swallowing difficulties, to prevent choking and aspiration. People with dysphagia may have a neurological condition, a weakening of the muscles or nerves in the oesophagus, or an obstruction in the throat. Liquids that are thin or low in viscosity, such as water, pose the greatest risk of choking for those with dysphagia.
The International Dysphagia Diet Standardisation Initiative (IDDSI) has created a scale to describe the thickness of liquids, ranging from mildly thickened to extremely thickened. Mildly thickened liquids, such as nectar, will still run off a spoon, but will leave a light film on its surface. Moderately thickened liquids, like honey, will drip off the tip of a spoon. Extremely thickened liquids are more solid and will not drip off a spoon. They are similar in consistency to pudding.
The amount of fluid that needs to be thickened is determined by the severity of the individual's dysphagia. Those with mild dysphagia may only require mildly thickened liquids, while those with more severe dysphagia may need thicker liquids.
Thickened liquids are not a diet of choice but rather a safety measure for those with swallowing difficulties. While they can improve swallow safety, they may also have unintended consequences, such as increasing the risk of dehydration and not quenching thirst. Additionally, the bioavailability of medication may be impaired when taken with thickened liquids.
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Thickeners come in starch-based and gum-based varieties
Thickened liquids are used for individuals who have difficulty swallowing, a condition called dysphagia. This condition can be caused by a neurological issue, such as a stroke, or a weakening of the muscles or nerves in the oesophagus. Thickened liquids are also used to prevent choking and aspiration. Thin liquids like water, milk, soda, coffee, juice, and soup broth flow down the throat quickly and can be unsafe for people with dysphagia.
Thickeners are added to liquids to increase their viscosity. Thickeners come in starch-based and gum-based varieties. Starch thickeners include all-purpose flour, rice flour, cornstarch, arrowroot or tapioca, and potato starch. Starch thickeners work through a process called gelatinization, where the starch molecules break down in the presence of water and heat, allowing more water to be absorbed and resulting in a thicker consistency. However, starch-based thickeners have some disadvantages. For example, they can continue to thicken over time after mixing, resulting in an inconsistent product.
Xanthan gum is a popular gum-based thickener that is stable over time and does not separate after freezing, making it a versatile option for patients. It also does not break down into simple sugars when consumed and does not interact with saliva, reducing the risk of choking and aspiration. Other gum-based thickeners include vegetable gums and pectin.
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Liquids have different levels of thickness
According to the IDDSI framework, liquids are classified into different levels based on their thickness. Level 0 liquids are thin and flow like water from a faucet, while Level 1 liquids are slightly thicker and flow a little less quickly. Level 2 liquids are mildly thick and nectar-like, with a consistency similar to a thicker cream soup. They can be easily poured and sucked through a standard straw with some effort.
Level 3 liquids are honey-like or moderately thickened, and while they can be sucked through a wide straw, they require some effort and time to swallow. Level 4 liquids are extremely thick and pudding-like. They can no longer be poured and require a spoon to eat. These liquids hold their shape and are more solid.
The level of thickness required depends on the severity of an individual's dysphagia, a disorder that causes difficulty in swallowing. Thicker liquids lower the risk of choking or coughing by slowing down the flow of liquids down the throat, making them easier to control. People with dysphagia may require thickeners, which are additives that increase the viscosity of fluids. Commercial thickeners are available in most pharmacies and grocery stores, and they come in starch-based and gum-based varieties.
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Frequently asked questions
A thickened liquid diet involves consuming liquids that have been thickened with a thickening agent, such as powders or gels, to make them safer to swallow.
A thickened liquid diet is often recommended for individuals who experience dysphagia, which is a swallowing disorder that can make it difficult to safely consume thin liquids.
Thin liquids include water, milk, soda, coffee, juice, and soup broth. These liquids can pose a choking hazard for those with dysphagia due to their low viscosity.
The International Dysphagia Diet Standardisation Initiative (IDDSI) has created a scale to describe the thickness of liquids. Nectar-like liquids are mildly thickened and will still run off a spoon, leaving a light film on the surface. Honey-like liquids are moderately thickened and will drip off the tip of a spoon. Spoon-thick liquids are extremely thickened and will not drip off a spoon, resembling the consistency of pudding.
Some liquids are naturally thicker, such as buttermilk. You can also purchase pre-thickened drinks or thickening products that you can mix into your drinks.
