A nasal insulin spray could soon offer new hope to people with Alzheimer's disease, research has suggested.
A report presented to delegates at the International Conference on Alzheimer's Disease (ICAD) found that 109 people treated with the product showed mild improvements in memory, although other symptoms were unaffected.
Researchers also detected a reduction in the amount of Alzheimer's-related proteins in the spinal fluid of a small group of participants.
The Alzheimer's Society claimed it was cautiously optimistic about the results.
A statement from the organisation said: "There are 465,000 people living with Alzheimer's in the UK yet we still have very few proven ways of lessening the effects of the disease. This latest research suggests insulin may improve certain symptoms such as memory.
"However, this is a very small preliminary study and we must be careful not to get carried away or expect to see an insulin-based treatment available anytime soon.
"Much more research is needed to move us closer to establishing the causes and finding a cure for this devastating condition."