Energy Metabolism and Cognitive Aging
|Mild Cognitive Impairment||Other: Ketogenic diet Other: Healthy high carbohydrate diet|
|Study Design:||Allocation: Randomized
Intervention Model: Parallel Assignment
Intervention Model Description:
Parallel groups, randomized controlled nutritional intervention.Masking: No masking
Primary Purpose: Prevention
|Official Title:||Energy Metabolism and Cognitive Aging|
- improvement in memory testing [ Time Frame: 6 or 8 weeks ]
- correlation between diet, metabolic factors, memory performance, and cerebral activation [ Time Frame: 6 or 8 weeks ]
|Study Start Date:||September 1, 2008|
|Study Completion Date:||March 15, 2017|
|Primary Completion Date:||December 31, 2016 (Final data collection date for primary outcome measure)|
Active Comparator: Healthy high carbohydrate diet
Participants will follow a typical, higher carbohydrate dietary intervention with emphasis on lower glycemic carbohydrate foods and monounsaturated fatty acid consumption
Other: Healthy high carbohydrate diet
higher carbohydrate diet
Experimental: Carbohydrate restricted, ketogenic diet
Paricipants will follow a carbohydrate restricted dietary intervention designed to induce ketone metabolism
Other: Ketogenic diet
carbohydrate restricted diet
Obesity and metabolic disturbance are recognized as important risks for disorders such as cardiovascular disease, stroke, and cancer. However, these conditions also contribute to age-related cognitive decline and dementia. In particular, insulin resistance and hyperinsulinemia promote neurocognitive dysfunction and neurodegenerative changes during the extended pre-clinical phase of Alzheimer's disease (AD). The prevalence of both metabolic disturbance and dementia are increasing dramatically, and in the absence of effective treatment, preventive approaches are essential to address the ominous public health concern represented by Alzheimer's disease and other forms of dementia. Dietary intervention is a promising and under-investigated preventive option. Regimens involving restricted carbohydrate consumption designed to induce ketone metabolism have been shown to improve metabolic parameters. In addition, ketone metabolism is associated with a host of benefits for neural function, among them enhanced mitochondrial energy production and reduction of neuropathological factors. Ketone feeding studies have demonstrated acute functional improvement in older adults with neurocognitive decline.
This research is designed to assess the efficacy of strict carbohydrate restriction in correcting hyperinsulinemia and improving neurocognitive function in older adults with early memory decline. Recently, we have shown that relatively brief intervention involving a low carbohydrate, ketogenic diet can improve memory in subjects with Mild Cognitive Impairment. We would like to extend these initial findings by adding new study arms involving older adult subjects with Parkinson's disease and Mild Cognitive Impairment. We also will increase the intervention period from six weeks to eight weeks.
Aim 1: To evaluate the effect of adaptation to ketosis on cognitive function in older adults with Age-Associated Memory Impairment (AAMI) and Mild Cognitive Impairment (MCI).
Hypothesis 1. Subjects with AAMI and MCI will show improved working memory and long-term memory ability after practicing a low carbohydrate, ketogenic diet for six weeks relative to comparison subjects who maintain a typical, high carbohydrate, nonketogenic diet.
Aim 2: To assess the effect of ketone metabolism on memory and motor function in subjects with Parkinson's disease and Mild Cognitive Impairment after eight (8) weeks of dietary intervention.
Hypothesis 2. Subjects with Parkinson's disease and MCI will show improved working memory and long-term memory function after practicing a low carbohydrate, ketogenic diet for eight weeks relative to comparison subjects who consume a typical, high carbohydrate nonketogenic diet.
Hypothesis 3. Subjects with Parkinson's disease and MCI will show improved motor function after practicing a low carbohydrate, ketogenic diet for eight weeks relative to comparison subjects who consume a typical, high carbohydrate nonketogenic diet.
We also will evaluate changes in mood, ketone body levels, serum lipids, inflammatory markers, and fasting glucose and insulin and assess relationships of these factors with the primary outcome measures. We will obtain diet records during the intervention to assess adherence to the protocol.
Please refer to this study by its ClinicalTrials.gov identifier: NCT00777010
|United States, Ohio|
|University of Cincinnati|
|Cincinnati, Ohio, United States, 45219|
|Principal Investigator:||Robert Krikorian, PhD||University of Cincinnati|