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Related Concept Videos

Dementia01:30

Dementia

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Dementia is a collective term for cognitive disorders primarily affecting memory, thinking, and reasoning. It is not a specific disease but a syndrome, with Alzheimer's disease being the most common cause, accounting for approximately 60-80% of cases. Other types include vascular dementia, Lewy body dementia, and frontotemporal dementia. Dementia affects millions worldwide, particularly older adults, though it is not a normal part of aging.
The progression of dementia is generally gradual....
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Dementia l: Introduction01:22

Dementia l: Introduction

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Dementia is an acquired, progressive syndrome characterized by a decline in multiple cognitive domains severe enough to impair daily functioning and reduce independence. Although memory loss is a central feature, the diagnosis requires additional deficits involving language, executive function, visuospatial skills, judgment, calculation, or abstract reasoning. These cognitive impairments reflect underlying neurodegenerative or vascular processes that gradually disrupt neuronal networks...
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Alzheimer Disease l: Introduction01:29

Alzheimer Disease l: Introduction

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Alzheimer disease is a chronic, progressive, and irreversible neurodegenerative disorder and the most common cause of dementia in older adults. It leads to gradual neuronal loss, causing cognitive decline, behavioral changes, and loss of functional independence.Risk Factors and EtiologyThe disease is multifactorial. Age is the strongest risk factor, with prevalence doubling every 5 years after age 65. Genetic factors include mutations in genes such as APP, PSEN1, and PSEN2, which are associated...
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Lipids: Dietary Sources and Requirements01:18

Lipids: Dietary Sources and Requirements

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Lipids are an essential component of a balanced human diet. Triglycerides, which make up the majority of dietary lipids, are found in both saturated fats—commonly present in meat, dairy products, and certain tropical plants like coconut, and hydrogenated oils such as margarine and baking shortenings (trans fats)—and unsaturated fats, which are abundant in seeds, nuts, olive oil, and most vegetable oils. The main sources of cholesterol include egg yolks, various meats and organ...
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Alzheimer's Disease: Overview01:26

Alzheimer's Disease: Overview

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Alzheimer's Disease (AD) is a continually advancing neurodegenerative disorder, distinguished by escalating memory loss, cognitive dysfunction, and dementia. The disease unfolds in three stages: preclinical, mild cognitive impairment (MCI), and dementia. Its onset is insidious, and the progression gradual, with the cause not well explained by other disorders.
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Alzheimer Disease ll: Pathophysiology01:23

Alzheimer Disease ll: Pathophysiology

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Alzheimer disease involves structural changes in the brain that begin long before symptoms appear. The most distinctive features are extracellular neuritic plaques and intracellular neurofibrillary tangles.Neuritic plaques form in the cerebral cortex and around blood vessels. These plaques contain a dense core of beta-amyloid (Aβ)—a toxic protein fragment that clumps outside neurons. The core is surrounded by damaged neuronal extensions, as well as reactive astrocytes and...
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Related Experiment Video

Updated: Apr 27, 2026

Measuring Oral Fatty Acid Thresholds, Fat Perception, Fatty Food Liking, and Papillae Density in Humans
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Dietary fat composition and dementia risk.

Martha Clare Morris1, Christine C Tangney2

  • 1Section of Nutrition and Nutritional Epidemiology, Department of Internal Medicine, Rush University Medical Center, Chicago, IL, USA.

Neurobiology of Aging
|June 28, 2014
PubMed
Summary

Dietary fat composition impacts dementia risk. High saturated and trans fats may increase risk, while polyunsaturated and monounsaturated fats may decrease it, influencing brain health.

Keywords:
Alzheimer's diseaseCognitive declineDementiaDietFatty acidsMonounsaturated fatsPolyunsaturated fatsSaturated fatsTrans fats

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Area of Science:

  • Neuroscience
  • Nutritional Science
  • Epidemiology

Background:

  • Dietary fat composition is increasingly recognized as a critical factor influencing neurological health.
  • The relationship between specific fatty acids and cognitive decline, particularly dementia, warrants further investigation.
  • Mechanisms linking dietary fats to brain function, including blood-brain barrier integrity and cholesterol metabolism, are complex and multifactorial.

Purpose of the Study:

  • To qualitatively review the scientific evidence connecting dietary fat composition to dementia risk.
  • To explore the underlying biological mechanisms and epidemiological findings related to dietary fats and cognitive health.
  • To reconcile inconsistencies in the literature regarding the impact of dietary fats on dementia.

Main Methods:

  • Qualitative review of laboratory, animal, and prospective epidemiologic studies.
  • Analysis of studies investigating biochemical or dietary fatty acids in relation to cognitive decline and dementia.
  • Evaluation of methodologies, including consideration of confounding factors in fatty acid analyses.

Main Results:

  • Evidence supports the hypothesis that high intake of saturated and trans fatty acids is associated with increased dementia risk.
  • Conversely, higher intake of polyunsaturated and monounsaturated fatty acids appears to be linked to a decreased risk of dementia.
  • Dietary fat composition influences blood-brain barrier function and blood cholesterol profiles, key factors in Alzheimer's disease neuropathology.

Conclusions:

  • Dietary fat composition is a significant modifiable factor influencing dementia risk.
  • Specific fatty acid profiles, particularly the balance between saturated/trans and unsaturated fats, play a crucial role in brain health.
  • Future research should focus on well-controlled studies that account for confounding variables to clarify the precise impact of dietary fats on cognitive decline.