Trial of a Brain Preservation Diet in Preventing Cognitive Decline in Old Age Hostel Residents

Study Overview
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Brief Summary
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Dementia is a major cause of disabilities in older people. If the onset of dementia can be delayed by preventive measures, the burden of the disease to the society can be greatly reduced. It is now recognised that dietary factors are related to the incidence of dementia. High intake of vegetables, fruit and fish are protective while high intake of saturated fat and salt (via its effect on blood pressure) are detrimental to risk of dementia. The investigators therefore propose to perform a randomized controlled trial of dietetic interventions in old age hostels in Hong Kong. Twelve old age hostels under the Tung Wah Group will be randomly assigned to intervention or control groups. The intervention group will receive dietetic interventions by 2 weekly small group discussion with the residents, modification of menu and publicity. The daily diet to be implemented consists of the following principles: 1. fresh fruit 2 portions, 2. vegetables 4 portions, 3. fish, 4. white meat, 5. sodium intake < 100 mmol/L, 6. six glasses of water. In the control group. The dietician will give two health talks and advice on menu only. The primary outcome is the incidence of questionable dementia in those who are normal at baseline and the incidence of dementia in those who have questionable dementia at baseline. The categorisation will be performed by trained research assistant after administering a structured questionnaire. Change in mini-mental examination score and SF36 quality of life scores are secondary outcomes. Food records over three days for each subject are recorded every three months, to ensure that the brain preservation diet has been adhered to. Half of the subjects will be randomly assigned to have blood and urine tests at baseline and at one year, in order to examine the health effects of dieting.

Official Title
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A Randonized Control Trial of a Brain Preservation Diet in Preventing Congnitive Decline in Odl Age Hostel Residents

Conditions
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Cognitive Decline, Dietetic Intake

Intervention / Treatment
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* Other: brain preservation' diet


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: old age home residents age 75 years or above, CDR<1 Exclusion Criteria: tube fed residents

Ages Eligible for Study
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Minimum Age: 75 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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No

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Prevention
Allocation: Non-Randomized
Intervention Model: Parallel Assignment
Masking: Single


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Active Comparator: 1<br>brain preservation diet | Other: brain preservation' diet<br>* dietetic evaluation and advice in small group for health diet<br>|
| No Intervention: 2<br> | |

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| cognitive decline |  | 33 months | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Change in MMSE test |  | 33 months | 
| % subjects meeting targets of brain preservation diet | brain preservation diet includes 3 portion of vergetables per day, 2 portion of fruit per day, 5 meal of fish per week, 6 glasses of water per day. | 33 months |