Life Extension Magazine January 2011
Feed Your Brain!
By Alan Smithee
Millions of people around the world are adhering to low-fat, low-cholesterol diets in an effort to reduce the impact of disease-promoting calories. What they don’t realize is they’re also starving their brains of specific nutrients needed for memory and healthy cognitive function.
“Heart-healthy” diets that restrict eggs, meats, cheese, and other sources of cholesterol and saturated fats may not be so healthy for the brain. Such diets can lead to shortages of two essential nutrients, choline (as alpha-glycerylphosphorylcholine) and serine (as phosphatidylserine), required by the brain to manufacture memory-related neurotransmitters and functional membrane lipids.
The brain’s demand for choline and serine becomes even more critical with aging. Recent trends in the incidence of cognitive dysfunction suggest that optimizing our intake of these compounds could help reverse the alarming rise in dementia among older Americans. An estimated 10-20% of people over 65 years of age already suffer from mild cognitive impairment1 and as many as 5.2 million people in the US are currently living with Alzheimer’s disease.2 Researchers predict that as many as 10 million baby boomers could develop Alzheimer’s during their lifetime.2
New research suggests that the biochemical processes that lead to cognitive decline represent a modifiable risk factor for the development of dementia, including Alzheimer’s disease, and that two essential brain nutrients, phosphatidylserine and alpha-glycerylphosphorylcholine (GPC), may enable aging humans to forestall or even reverse declines in memory and cognitive performance.
Phosphatidylserine: A Documented Way to Fight Brain Aging
Phosphatidylserine is essential to help brain neurons support and maintain memory function and neuroplasticity—the dynamic capacity to replace damaged neurons and to make new ones. Neuron-to-neuron communication and neuroplasticity depend on a steady supply of phosphatidylserine and other “smart” nutrients.
Maintaining an optimal intake of phosphatidylserine is crucial to preventing age-related cognitive decline. Even if you are a healthy individual today, research shows that you could eventually experience a dramatic decline in your cognitive capacities by the time you reach 70 years of age.3
In 2003, even the biased FDA granted “qualified health claim” status to phosphatidylserine, allowing supplement manufacturers to state that “consumption of phosphatidylserine may reduce the risk of dementia in the elderly” and “consumption of phosphatidylserine may reduce the risk of cognitive dysfunction in the elderly.”4
Studies suggest that phosphatidylserine can benefit people of all ages. In the middle-aged and the elderly, phosphatidylserine has been shown to prevent and restore memory loss5 and alleviate stress6 and anxiety.7 Preliminary research indicates that phosphatidylserine may also benefit children with attention, learning, or behavioral problems.8-10
A significant component of human breast milk, phosphatidylserine11 is classified as a phospholipid. Phospholipids are orthomolecules12 (those naturally present in the body) that play a vital role in cell-to-cell communication in the brain and are required to maintain the fluidity of all cell membranes. Membranes are the “working surfaces” of every cell, carrying out cellular communication and hormonal signal transduction.
Preclinical13-17 and human studies5,18,19 have shown that phosphatidylserine can favorably affect neuronal membranes, cell metabolism, and levels of brain neurotransmitters such as acetylcholine. Two “meta-analyses” of multiple clinical studies concluded that phosphatidylserine could provide significant benefits for cognitive functions that typically decline with age, including concentration, learning, memory, and vocabulary skills.20,21
By boosting glucose metabolism and stimulating production of acetylcholine, supplemental phosphatidylserine (100 mg three times daily) has been shown to improve cognitive performance in patients experiencing age-associated memory impairment or other signs of cognitive decline.22,23
In a double-blind, placebo-controlled trial involving 425 patients ages 65-93 with moderate-to-severe cognitive decline, investigators gave study participants oral doses of 300 mg of phosphatidylserine daily for up to six months. Those individuals in the treatment group showed consistent improvement in clinical global impression and such activities of daily living as memory, learning, and socialization.24
Results of a recent Israeli Phase IV clinical trial showed that a nutraceutical formulated with phosphatidylserine (100 mg) and GPC (600 mg) could significantly improve memory and restore loss of essential mental skills in men and women 67-80 years of age.25 The study’s investigators were able to measure this remarkable improvement in 15 weeks. In other studies, most using phosphatidylserine at a dosage of 300-400 mg/day, improvement tended to be the greatest in those with less severe cognitive impairment.22,26-28
GPC: A Brain-Friendly Form of Choline for Mental Health
Choline is found in foods such as beef and chicken liver, egg yolk, soybeans, beef, milk, and peanuts. However, strict vegetarians, endurance athletes, people who drink a lot of alcohol, and those who follow low-fat/low-cholesterol diets may be at risk of choline deficiency.
GPC (alpha-glycerylphosphorylcholine), like phosphatidylserine, is an orthomolecular compound (found naturally in the brain), where it serves as an acetylcholine precursor.29,30 Acetylcholine is an essential neurotransmitter involved in memory, cognition, sleep, and neuromuscular control.31 Acetylcholine decline coincides with advancing age, and is a hallmark of neurodegenerative disease.
In Europe, GPC is regulated as a prescription drug used to treat Alzheimer’s disease, where it is known under the generic name, choline alphoscerate. In the United States, GPC is available as a dietary supplement. GPC is believed to prevent and ameliorate dementia and memory and learning loss because it increases plasma levels of choline and therefore increases production of acetylcholine and phosphatidylcholine.32,33
In a well-controlled multicenter study that included 261 participants, GPC significantly improved cognitive function in patients with mild-to-moderate Alzheimer’s disease.34 The patients were randomly assigned to receive either 1,200 mg of GPC or placebo daily for six months, and both groups were similarly impaired before entering the study. Patients who received GPC scored better than those who received placebo at three months and at six months. A measure of cognitive function substantially improved in the GPC treated group, but worsened in the placebo group. Compared to placebo, the GPC group also fared better in behavioral improvement and standardized physician ratings. What makes these results particularly encouraging is that they resemble those obtained through the use of three currently prescribed Alzheimer’s drugs: Aricept®, Exelon®, and Razadyne®.
Other human trials of GPC reveal equally impressive results. One review of published clinical data on GPC and cognitive decline in 10 controlled trials with a total of 1,570 patients with various forms of dementia concluded that GPC was better or equal to those observed in control groups under active pharmacological treatment and superior to the results observed in placebo groups.35
GPC may protect and facilitate communication between nerves through its effect on receptors for nerve growth factor
GPC has also been used to treat people who suffer from stroke and transient ischemic attack (TIA). In one study, 2,044 patients received GPC within 10 days post-stroke or TIA (1,000 mg/day intramuscularly for 28 days followed by 400 mg three times daily orally for the next five months). At the end of the trial, a remarkable 71% showed no cognitive decline or forgetfulness.36
GPC may protect and facilitate communication between nerves through its effect on receptors for nerve growth factor, a naturally occurring substance that regulates acetylcholine receptors. With aging, the number of nerve growth factor receptors typically decline. GPC promotes the growth, repair, and increased expression of nerve growth factor receptors in the cerebellar cortex, a brain region responsible for coordination and movement control.37
Animal studies have shown that GPC treatment counters the age-dependent reduction of nerve cell density and acetylcholine receptors in the hippocampus of older rats.38,39 These results suggest that GPC treatment is effective in slowing down the expression of structural changes occurring in the aging brain.
Another animal study found that long-term treatment with GPC offset, in part, the loss of nerve fibers and brain cells that typically occurs with aging. In GPC-treated rats, both the density and the area occupied by neuroconnecting fibers were significantly higher than in age-matched controls. The number of neurons of the hippocampus, a part of the brain that is closely associated with the cerebral cortex, was higher in GPC-treated animals than in control 24-month-old rats. Study investigators stated that it appears GPC treatment “counteracts some anatomical changes of the rat hippocampus occurring in old age.”40
Safer Than Prescription Drugs
It is widely recognized that a decline in brain acetylcholine levels coincides with advancing age and that such a decline can lead to neurodegeneration, a hypothesis that was proposed almost 30 years ago.45
It is now believed that a dysfunction of acetylcholine-related neurons and their “transmission lines” (axons and dendrites) in the brain contribute to the cognitive decline observed in aging humans and in those diagnosed with Alzheimer’s disease. This hypothesis has provided the dominant rationale for the development of drugs to treat dementia, which are designed to deactivate an enzyme that degrades acetylcholine. Regrettably, the prescription drugs such as Aricept® (donepezil) which were designed to block the acetylcholinesterase enzyme in the brain suffer from poor benefit-to-risk profiles and pose numerous health risks to older patients who use them.46,47
As acetylcholinesterase inhibitors, these drugs increase the concentration of acetylcholine at the synapse (nerve-to-nerve junction) for longer periods, thereby enhancing activity in nerve pathways that use acetylcholine. Unlike drugs that inhibit the breakdown of acetylcholine, GPC stimulates the manufacture of new acetylcholine. This could be one reason for GPC’s greater safety record compared to prescription drugs.
Mild cognitive decline is no longer considered solely a normal part of aging.
Memory deficits can occur because of suboptimal intakes of neuroprotective and neurotrophic nutrients through “low-fat” and low cholesterol dieting, consuming foods devoid of such nutrients, and lifestyle-related chronic inflammation and oxidative damage to brain neurons.
By taking advantage of recent advances in our understanding of cognition, memory, and nerve cell function, health-conscious adults can use safe and effective brain-protective nutrients such as phosphatidylserine and GPC to prevent and reverse the very nutrient deficits that can lead to cognitive decline. A large body of published evidence indicates that phosphatidylserine and GPC play vital roles in helping aging individuals to maintain sharper memory and other cognitive abilities.
If you have any questions on the scientific content of this article, please call a Life Extension® Health Advisor at 1-866-864-3027.
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