Nurses spend a great deal of time choosing dressings, offloading pressure and preventing infection. All of these matter. But a wound cannot heal well if the body lacks the building blocks for new tissue. Malnutrition is common in hospitals, care homes and the community, especially among older people, and it slows healing, increases infection and raises the risk of pressure ulcers.
This guide explains how nutrition affects wound healing, the key nutrients involved, signs of malnutrition, practical food ideas, and the nurse’s role in screening and support.
Imagine an 82-year-old woman with a pressure ulcer on her heel that has not improved in six weeks despite careful dressings. Her daughter mentions that she eats only a few spoons of soup each day and drinks little because she worries about getting to the toilet. A nurse completes a nutrition screen, involves the dietitian, offers small, frequent high-protein snacks and helps with toileting. Over the next month, the wound starts to shrink. The dressing did not change. Her nutrition did.
How wounds heal
Wound healing happens in overlapping phases: stopping bleeding (haemostasis), inflammation, building new tissue (proliferation), and strengthening (remodelling). Each phase needs energy and nutrients, especially protein for new tissue and immune cells.
Key nutrients for wound healing
| Nutrient | Why it matters | Food sources |
|---|---|---|
| Energy (calories) | Fuels healing; without it, the body breaks down muscle | Rice, yam, bread, oils, nuts, full-fat dairy |
| Protein | Builds new tissue, collagen and immune cells | Eggs, fish, meat, chicken, beans, lentils, milk, yoghurt, groundnuts |
| Fluids | Maintain blood flow and skin integrity | Water, milk, soups, fruit |
| Vitamin C | Collagen formation, immunity | Oranges, guava, peppers, tomatoes, leafy greens |
| Zinc | Cell growth and immune function | Meat, shellfish, beans, seeds, whole grains |
| Vitamin A | Epithelial growth, immunity | Liver, eggs, carrots, sweet potato, palm oil, leafy greens |
| Iron | Oxygen delivery to tissues | Red meat, liver, beans, leafy greens |
Supplements should be given only when there is a deficiency or on the advice of a healthcare provider or dietitian. More is not always better.
Who is at risk of poor healing from malnutrition?
- Older adults, especially those living alone.
- People with dementia, stroke or swallowing problems.
- People with cancer, chronic kidney disease, liver disease or diabetes.
- People after major surgery, burns or trauma.
- People with depression, poverty or food insecurity.
- People with poor dental health.
Signs of malnutrition
- Unintentional weight loss; loose clothes, rings or dentures.
- Low body mass index.
- Reduced appetite or eating less than half of meals.
- Muscle wasting and weakness.
- Slow-healing wounds, frequent infections.
- Dry skin, brittle hair, sore mouth.
Screening
Use a validated tool such as MUST (Malnutrition Universal Screening Tool) on admission and regularly afterwards. See our guide to MUST screening for nurses.
Practical ideas to improve intake
- Small, frequent meals and snacks rather than three large meals.
- Food first: fortify foods by adding milk powder to porridge, eggs to soups, groundnut paste to sauces, oil or butter to vegetables.
- High-protein snacks: boiled eggs, yoghurt, milk, nuts, beans, fish.
- Protected mealtimes: no unnecessary interruptions; help with opening packets and positioning.
- Assistance with eating where needed, with dignity.
- Treat the barriers: pain, nausea, constipation, poor teeth, depression, swallowing problems.
- Oral nutritional supplements when recommended by a dietitian or healthcare provider.
- Monitor: food and fluid charts, weight weekly.
Special situations
- Diabetes: good glucose control supports healing; work with the diabetes team rather than restricting food excessively.
- Kidney disease: protein, potassium and fluid needs differ; involve a renal dietitian.
- Obesity: people with obesity can still be malnourished; do not assume.
Combine good nutrition with pressure prevention; see our guide to pressure ulcer stages and prevention.
Frequently asked questions
What should I eat to heal a wound faster?
Enough energy and protein, plus fluids and foods rich in vitamin C, zinc and vitamin A, such as eggs, fish, beans, fruit and vegetables.
Do vitamin supplements speed healing?
Only if you are deficient. Ask a healthcare provider or dietitian before taking them.
Why do older people heal slowly?
Reduced appetite, chronic illness, reduced mobility and malnutrition all contribute.
How do nurses screen for malnutrition?
Using tools such as MUST, weight monitoring and food charts.
But isn’t wound care about dressings?
Dressings protect and manage the wound environment, but healing happens inside the body. Nutrition, blood supply, pressure relief and infection control are all part of wound care.
Your next step: For every patient with a wound on your next shift, check when they were last weighed and screened for malnutrition, and look at what they actually ate today.
Related: MUST screening · Pressure ulcers · Wound dressings guide
Sources: European Pressure Ulcer Advisory Panel / NPIAP / PPPIA international guideline on pressure injury prevention and treatment (nutrition section); ESPEN guidelines on clinical nutrition; BAPEN MUST tool.
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