The Effect of Daily Consumption of Eggs on Cognitive Function in the Elderly
| Status: | Completed |
|---|---|
| Conditions: | Cognitive Studies |
| Therapuetic Areas: | Psychiatry / Psychology |
| Healthy: | No |
| Age Range: | 50 - Any |
| Updated: | 9/2/2017 |
| Start Date: | July 2012 |
| End Date: | August 2015 |
The Effect of Consumption of 2 Eggs or 4 oz of Egg Substitute Daily for 6 Months on Cognitive Function in Older Adults.
Cognitive impairment is also a major risk factor for development of dementia later in life.
Findings from our studies suggest that the carotenoids, lutein and zeaxanthin may be
important in cognitive function in the elderly. The investigators have previously reported
eggs to be a highly bioavailable source of lutein and zeaxanthin. Our study evaluates
long-term egg intervention as a treatment strategy for age-related cognitive impairment which
could possibly prevent the onset of dementia. The investigators have also shown that lutein
supplementation significantly improved verbal fluency scores in healthy older women. Our
studies have shown that egg interventions can significantly increase serum lutein
concentrations in older adults. Based on the sum of our findings, the next logical step will
be to investigate the ability of lutein and zeaxanthin contained in eggs to influence
cognitive function in older adults. The investigators hypothesize that there will be a
significant increase in cognitive function measures in older adults provided with meals
containing 2 egg/day at the end of 6 months, while no significant improvements will be
observed in older adults given daily meals containing egg substitute.
The proposed study is designed as a randomized, placebo controlled trial that tests the
effects of 6 month supplementation with 2 eggs/day on cognitive function in older adults.
Secondary analyses will determine whether baseline MP density predicts relative effectiveness
of the intervention on cognitive function. Secondary outcomes include plasma biomarkers of
oxidative stress and inflammation.
Findings from our studies suggest that the carotenoids, lutein and zeaxanthin may be
important in cognitive function in the elderly. The investigators have previously reported
eggs to be a highly bioavailable source of lutein and zeaxanthin. Our study evaluates
long-term egg intervention as a treatment strategy for age-related cognitive impairment which
could possibly prevent the onset of dementia. The investigators have also shown that lutein
supplementation significantly improved verbal fluency scores in healthy older women. Our
studies have shown that egg interventions can significantly increase serum lutein
concentrations in older adults. Based on the sum of our findings, the next logical step will
be to investigate the ability of lutein and zeaxanthin contained in eggs to influence
cognitive function in older adults. The investigators hypothesize that there will be a
significant increase in cognitive function measures in older adults provided with meals
containing 2 egg/day at the end of 6 months, while no significant improvements will be
observed in older adults given daily meals containing egg substitute.
The proposed study is designed as a randomized, placebo controlled trial that tests the
effects of 6 month supplementation with 2 eggs/day on cognitive function in older adults.
Secondary analyses will determine whether baseline MP density predicts relative effectiveness
of the intervention on cognitive function. Secondary outcomes include plasma biomarkers of
oxidative stress and inflammation.
The study is designed as a placebo controlled trial that tests the effects of 6 month
supplementation with 2 eggs or 4 ounces of egg substitute a day on cognitive function in
older adults. Subjects will be randomly assigned to one of the two groups. Secondary analyses
will determine whether baseline macular pigment density (a non invasive measure of lutein and
zeaxanthin in neural tissue) or choline status predicts relative effectiveness of the
intervention on cognitive function. Secondary outcomes include plasma biomarkers of oxidative
stress and inflammation, choline bioavailability, and genetic variants related to endogenous
choline production. Participants will be recruited from community-dwelling men and women aged
> 50 yr, and potential participants will be screened to meet cognitive and functional
criteria. Participants will be pre-screened by telephone; those who appear to meet criteria
will undergo further screening. The study will include baseline (0 month), 3 and 6 month
visits for study procedures, and monthly telephone calls. Given that there is a visible
difference between the two interventions (eggs, egg substitute), a blinded study is not
possible.
supplementation with 2 eggs or 4 ounces of egg substitute a day on cognitive function in
older adults. Subjects will be randomly assigned to one of the two groups. Secondary analyses
will determine whether baseline macular pigment density (a non invasive measure of lutein and
zeaxanthin in neural tissue) or choline status predicts relative effectiveness of the
intervention on cognitive function. Secondary outcomes include plasma biomarkers of oxidative
stress and inflammation, choline bioavailability, and genetic variants related to endogenous
choline production. Participants will be recruited from community-dwelling men and women aged
> 50 yr, and potential participants will be screened to meet cognitive and functional
criteria. Participants will be pre-screened by telephone; those who appear to meet criteria
will undergo further screening. The study will include baseline (0 month), 3 and 6 month
visits for study procedures, and monthly telephone calls. Given that there is a visible
difference between the two interventions (eggs, egg substitute), a blinded study is not
possible.
Inclusion Criteria:
- men and women age > 50 years
- BMI 19-30 kg/m2
- lutein intake of < 3 mg/d
- DHA (docosahexaehoic acid) intake < 250 mg/d (including supplements)
- Mini mental state exam (MMSE) score > 24 (Appendix B)
- macular pigment density < 0.5 at 0.5 degrees
- Beck Depression Inventory < 20
- free of known disease;
- BMI 19-29 kg/m2
- must be able to give written informed consent
- have normal hematologic parameters
- normal values of plasma albumin
- normal values for liver and kidney function (Appendix A)
- no use of carotenoid, n3 fatty acid, multivitamin/mineral, or choline supplements (> 3
months).
We found this trial at
1
site
Boston, Massachusetts 02111
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