Nutrition and Pressure Injuries: Why Feeding the Patient Is Part of the Dressing Plan

Quick answer: pressure injuries are not only a pressure problem, they are also a nutrition problem. Skin that is short of protein, calories, zinc and vitamin C repairs badly and breaks down faster. A randomised trial at the University of Cadiz (NCT06726486) tested whether an oral supplement enriched with arginine, omega 3 and nucleotides beats a standard high protein drink in malnourished hospital patients. Results are not yet posted, but the underlying principle is well accepted: feed the patient, or the dressing will not save the skin.

Why does nutrition matter for pressure injuries?

Building new tissue is expensive. Collagen synthesis needs protein and vitamin C, cell division and immune defence need zinc, and the whole process needs enough calories that the body is not breaking down its own muscle to pay for it. When someone is malnourished, three things happen at once:

• The cushion disappears. Loss of subcutaneous fat and muscle mass means bony prominences such as the sacrum, heels and hips sit closer to the surface, so the same amount of lying or sitting concentrates more pressure on less tissue.
• The skin gets more fragile. Low protein states are associated with oedema and thinner, less elastic skin that tolerates shear poorly.
• Repair slows down. A wound that would close in weeks stalls, and a stalled wound is an open door for infection.

This is why nutrition screening sits inside every serious pressure injury prevention bundle, alongside repositioning, support surfaces and skin care. It is not an optional extra at the end of the list. We cover the specific nutrients involved in 5 nutrients that help wounds heal.

What is the Cadiz trial actually testing?

The study (NCT06726486) was a randomised controlled trial run by the University of Cadiz, registered as Phase 4, that enrolled 69 malnourished patients with multiple co-existing conditions. It ran from January 2022 to April 2023 and is listed as completed.

Both groups received a complete high protein, high calorie oral nutritional supplement with a fibre blend, taken daily for 30 days. The difference was what the intervention formula added on top: omega 3, L arginine and nucleotides, with vitamin C and zinc. The team measured the presence of pressure related injuries, the assessed risk of developing them, how the existing ones were categorised, whether they healed, and the patient's degree of dependence, at 15 and 30 days.

An honest caveat: no results have been posted to the registry for this trial, so we cannot tell you whether the enriched formula outperformed the standard one. Treat it as a question being asked, not an answer already given. Note too what the comparison really was. This was enriched supplement versus plain supplement, not supplement versus nothing, so even a null result would not mean nutrition does not matter. It would mean the added immunonutrients did not add much on top of adequate protein and calories.

Who is most at risk?

The overlap between malnutrition risk and pressure injury risk is large. Watch closely for anyone who is:

• Immobile or largely bed bound, especially after a stroke, fracture or major surgery
• Eating poorly for more than a few days, or losing weight without trying
• Living with dementia, where meals get forgotten or refused
• Managing swallowing difficulty, so intake quietly falls below need
• Dealing with chronic wounds already, which themselves leak protein and raise requirements
• Incontinent as well as immobile, which adds moisture damage to the pressure load

A simple practical marker for families at home: if someone has left more than half of most meals for a week, or their usual clothes and rings have become noticeably loose, that is worth raising with the care team rather than waiting for the next scheduled review.

What can carers do at home?

Where someone cannot meet their needs by mouth at all, feeding may move to a tube, and the practicalities of that at home are set out in our guide to NG tube versus PEG tube feeding in Singapore. None of this replaces an individualised plan from a doctor or dietitian, but the general direction is consistent:

• Protein at every meal, not just dinner. Spreading intake across the day is easier on a small appetite than one large plate.
• Offer smaller meals more often. Six small offerings usually beat three large ones for someone who tires while eating.
• Do not forget fluids. Dehydrated skin is less resilient, and constipation makes everything else harder.
• Keep repositioning anyway. Nutrition supports the tissue, it does not offload it. Regular position changes and an appropriate mattress or cushion still do the mechanical work — see our home guide to preventing pressure injuries, and browse pressure care and wound treatment products.
• Ask about a formal assessment. If intake has been poor for a week or more, or a wound is not progressing, that is the point to ask about a dietitian review rather than self prescribing supplements.

When should you escalate?

Get professional review promptly if you see skin that stays red after pressure is relieved, any break in the skin over a bony area, a wound that smells, spreads or produces increasing discharge, fever, or a wound that has simply stopped improving over two weeks of reasonable care. Early pressure damage is far easier to reverse than a deep injury, and the window is measured in days.

This article is general information, not medical advice. Nutritional needs vary a great deal with kidney function, diabetes, swallowing safety and other conditions, and some supplements are not appropriate for everyone. Please consult your doctor, dietitian or wound care nurse before changing a care plan.

EMIS+ supplies wound care, continence and ostomy products to homes, clinics and care facilities across Singapore. If you are caring for someone at risk of pressure injuries and are not sure what you need, you can browse our medical nutrition supplements and wound care range at www.emis.asia.