Diet specificationAdult

Published: August 2026. Next review: 2031.


Fluid diet - elemental

This document is part of the ACI Diet Specifications for Adult Inpatients. It is not to be used for patient education.

Aim

To provide a diet with nutrients as small molecular weight compounds, i.e. proteins as amino acids or peptides, carbohydrates as oligosaccharides or monosaccharides, and fats as medium-chain triglycerides.

Characteristics

All nutrition provided by commercial elemental liquid oral nutrition supplements.

Indications

Consider for patients with gastrointestinal diseases such as Crohn’s disease or ulcerative colitis.

    This diet should only be used under dietetic supervision.

    Nutritional adequacy

    Palatability of the elemental nutritional supplements may limit a patient's ability to meet their energy needs. Exclusive extended use of elemental formulas can result in essential fatty acid deficiency.

    Precautions

    Variety and choice are severely limited in this diet.

    Paediatrics

    Suitable for use in paediatrics.

    Specific menu planning guidelines

    Allowed Not allowed
    Hot main dishes Nil All
    Sauces, gravies Nil All
    Starchy vegetables / pasta / rice Nil All
    Vegetables Nil All
    Soups Nil All
    Sandwiches Nil All
    Salads, dressings Nil All
    Breads, cereals Nil All
    Spreads Nil All
    Hot breakfast choices Nil All
    Fruit Nil All
    Yoghurt Nil All
    Desserts Nil All
    Milk and cheese Nil All
    Beverages

    Water

    All others
    Biscuits Nil All
    Miscellaneous

    Sugar

    Plain boiled sweets

    Commercial liquid oral elemental nutrition supplements

    All others
    Celebratory foods, special occasions Nil All

    Change log

    Change date Section updatedChange
    August 2026 General language Updated to be consistent with ACI style writing guide
    Characteristics Updated to require dietetic supervision
    Indications Updated
    Nutritional  adequacy Updated to reduce ambiguity
    Paediatrics Removed reference to combining with an age-appropriate diet
    References Removed
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