What Are Texture Modified Diets? IDDSI Explained

If you or someone you care for has been diagnosed with a swallowing difficulty, you may have been told to eat a particular texture of food or drink a certain consistency of fluid. But what does that actually mean in practice? And who decides?

This post explains the IDDSI framework - the international standard for describing and testing food and drink textures - and what the different levels look like in real life.

Why texture modification matters

Swallowing difficulties can affect the ability to safely manage certain food and drink textures. Thin liquids flow quickly and require fast, precise airway protection - which makes them difficult for many people with neurological dysphagia. Dry, crumbly or hard foods may be difficult to chew and form into a safe bolus before swallowing.

Modifying the texture of food and drink to something the person can manage more safely reduces the risk of aspiration while maintaining adequate nutrition and hydration.

What is IDDSI?

IDDSI stands for the International Dysphagia Diet Standardisation Initiative. It is a framework developed by an international group of researchers and clinicians to provide a common language for describing food and drink textures used in dysphagia management.

Before IDDSI, different hospitals, care homes and services used different terms - "minced," "soft," "thickened" - that meant different things in different places. This created real safety risks when people moved between services. IDDSI was introduced to standardise terminology and make recommendations transferable.

The IDDSI levels

IDDSI uses a scale of 0 to 7, covering both drinks and foods.

For drinks: Level 0 (Thin) covers normal, unmodified drinks such as water, tea and juice. Level 1 (Slightly thick) is slightly thicker than water. Level 2 (Mildly thick) flows through a fork slowly. Level 3 (Moderately thick) can be drunk from a cup but flows slowly. Level 4 (Extremely thick) cannot be drunk from a cup and is eaten with a spoon.

For foods: Level 3 (Liquidised) means completely smooth and pourable with no lumps. Level 4 (Pureed) means smooth and cohesive, able to hold a shape, eaten with a spoon. Level 5 (Minced and moist) means small, moist pieces no larger than 4mm requiring minimal chewing. Level 6 (Soft and bite-sized) means tender pieces easily mashed with the tongue. Level 7 (Regular) means normal, everyday foods with no restriction.

Who decides which level is needed?

Texture recommendations should always come from a Speech and Language Therapist following a proper assessment. IDDSI levels are not interchangeable - moving someone from one level to another without specialist input can significantly affect their safety at mealtimes.

If you have received a recommendation from an SLT and you are unsure how to implement it in practice, ask for practical guidance - this is part of the SLT's role.

Common misconceptions

Texture modified food does not have to be unappetising. With the right equipment and technique, texture modified meals can be well-presented and enjoyable. Sauces and seasonings can be added at any level, and moulds can reshape pureed food to look like its original form.

Texture modification is not necessarily permanent. For some people - particularly those recovering from stroke or an acute illness - swallowing function may improve with therapy, and texture recommendations are reviewed and updated accordingly.

Thickened drinks are not all the same. The IDDSI levels are specific, and the method of preparing thickened drinks - the powder-to-liquid ratio, the thickener brand, the time allowed for thickening - affects the result significantly. Follow your SLT's guidance precisely.

If you are supporting someone with dysphagia at home, our practical guide for carers has more on implementing texture recommendations in daily life. You can also read more about what a dysphagia assessment involves if you have not yet had specialist input.