People with Down syndrome need around 10–15% less energy than their peers, and often have difficulty recognising hunger and fullness. That combination — not willpower, and not what someone is choosing to eat — is why weight gain is so common. It is also why generic healthy eating advice usually does not work, and why dietetic support funded through the NDIS can make a practical difference.

This guide explains what changes nutritionally in Down syndrome, what a dietitian actually does about it, and how to access support through an NDIS plan.

Why is weight gain so common in Down syndrome?

Two things are happening at once.

The first is metabolic. People with Down syndrome have a lower resting metabolic rate than the general population, often requiring 10–15% less energy each day. Someone can be eating what looks like a completely normal amount of food for their age and still gain weight.

The second is interoception — the body’s internal signalling. Hunger and fullness cues are often harder to read, which can lead to eating past the point of comfort. Research also suggests people with Down syndrome may have lower leptin levels, the hormone involved in signalling fullness.

Put together, standard portion advice and “just eat less” guidance tends to fail, and families are often left feeling like they are doing something wrong. They are not.

What families and carers often try first

There are three approaches we commonly see tried before a dietitian is involved, and they tend not to work:

  • Ignoring reduced energy needs.
  • Overlooking fibre and fluid requirements.
  • Changing the diet routine too quickly, and overwhelming the individual.

How does low muscle tone affect eating?

Reduced muscle tone (hypotonia) is common in Down syndrome and affects more than mobility and strength.

  • Chewing and swallowing. In both children and adults, hypotonia can affect the oral motor muscles, making chewing tiring and swallowing less safe. This can show up as slow eating, fatigue at mealtimes, coughing, or avoiding harder-textured foods.
  • Gut motility. Reduced tone contributes to constipation, which is one of the most common — and most under-treated — issues we see.

Where swallowing safety is a concern, we assess mealtime safety using the IDDSI framework and work alongside a speech pathologist, rather than making texture decisions in isolation.

What other health risks should families know about?

  • Obesity and type 2 diabetes, linked to the energy and appetite factors above.
  • Constipation and other gastrointestinal concerns.
  • Early-onset dementia, which can affect appetite, routine and the ability to prepare food independently — nutrition needs often change significantly at this stage.

None of these are inevitable. Most respond well to early, practical support.

Signs a dietitian could help

Nutritional concerns typically seen in a person with Down syndrome that may warrant dietetic support include:

  • Weight gain and/or mobility concerns.
  • Executive functioning impairments — such as challenges retaining higher-level health information, making informed independent decisions about food choice, or independently planning and preparing nutritious meals.
  • Difficulty maintaining a consistent healthy eating routine, due to over-consumption.

What does a dietitian actually do?

The goal is not a diet. It is building routines and skills that hold up in real life, and protecting health over the long term. That usually includes:

  • Building a sustainable eating routine that supports healthy weight, energy, mood and muscle preservation — set around what the person actually likes and the household’s real schedule.
  • Practical mealtime strategies, including pacing, portioning, the mealtime environment, and supporting the person to recognise their own hunger and fullness where possible.
  • Bowel health management, which often produces the fastest visible improvement in comfort and behaviour.
  • Working with the speech pathologist on oral motor function and safe textures, to delay or prevent chewing and swallowing difficulties.
  • Supporting physical activity alongside nutrition, since muscle mass protects metabolic rate.
  • Training support workers, SIL staff and family so the approach is consistent wherever the person eats — which is usually what determines whether anything sticks.

What does a realistic first goal look like?

We focus on one small change to the person’s current eating routine. This supports long-term compliance and prevents them from becoming overwhelmed.

For example, swapping a high-sugar snack for a similar low-sugar alternative.

Can NDIS funding be used for a dietitian?

Yes. Where nutrition, eating or mealtimes affect daily life, independence or health, dietetic support is generally funded under Capacity Building — Improved Daily Living or Improved Health and Wellbeing, and in some cases under Core supports.

We support self-managed, plan-managed and NDIA-managed participants. Our pricing follows the NDIS Price Guide, so there is no gap fee, and invoices include the correct line item codes. Current rates are listed on our pricing page. We also prepare reports ahead of plan reviews documenting outcomes and recommending future funding.

You do not need a doctor’s referral. A support coordinator, family member, support worker or the participant can contact us directly.