Poor nutrition has been found to be a major problem among people with dementia, according to a new international report on current research into dementia.
It says up to 45 percent of those with dementia experience weight loss that could affect their general health, over a one year period.
It also shows that up to half of those with dementia living in care homes don't get enough food.
The report makes a series of recommendations, which include adopting nutritional standards of care for people with dementia throughout the health and social care sectors.
Alzheimers New Zealand says the number of people with dementia is set to triple to 150,000 by 2050.