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Study Peeks Into Healthy Brains to Hunt Alzheimer’s Culprit

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In this photo taken May 19, 2015, Judith Chase Gilbert, of Arlington, Va., is loaded into a PET scanner by Nuclear Medicine Technologist J.R. Aguilar at Georgetown University Hospital in Washington. Gilbert shows no signs of memory problems but volunteered for a new kind of scan as part of a study peeking into healthy brains to check for clues about Alzheimer's disease. (AP Photo/Evan Vucci)

In this photo taken May 19, 2015, Judith Chase Gilbert, of Arlington, Va., is loaded into a PET scanner by Nuclear Medicine Technologist J.R. Aguilar at Georgetown University Hospital in Washington. Gilbert shows no signs of memory problems but volunteered for a new kind of scan as part of a study peeking into healthy brains to check for clues about Alzheimer’s disease. (AP Photo/Evan Vucci)

LAURAN NEERGAARD, AP Medical Writer

WASHINGTON (AP) — Sticky plaque gets the most attention, but now healthy seniors at risk of Alzheimer’s are letting scientists peek into their brains to see if another culprit is lurking.

No one knows what actually causes Alzheimer’s, but the suspects are its two hallmarks — the gunky amyloid in those brain plaques or tangles of a protein named tau that clog dying brain cells. New imaging can spot those tangles in living brains, providing a chance to finally better understand what triggers dementia.

Now researchers are adding tau brain scans to an ambitious study that’s testing if an experimental drug might help healthy but at-risk people stave off Alzheimer’s. Whether that medication works or not, it’s the first drug study where scientists can track how both of Alzheimer’s signature markers begin building up in older adults before memory ever slips.

“The combination of amyloid and tau is really the toxic duo,” predicted Dr. Reisa Sperling of Boston’s Brigham and Women’s Hospital and Harvard Medical School, who is leading the so-called A4 study. “To see it in life is really striking.”

The A4 study — it stands for Anti-Amyloid Treatment in Asymptomatic Alzheimer’s — aims to enroll 1,000 healthy seniors like Judith Chase Gilbert, 77, of Arlington, Virginia. The recently retired government worker is mentally sharp but learned through the study that her brain harbors amyloid buildup that might increase her risk. Last week, researchers slid Gilbert into a doughnut-shaped PET scanner as she became one of the first study participants to also have their brains scanned for tau.

“We know that tau starts entering the picture at some point, and we do not know when. We do not know how that interaction happens. We should know,” said chief science officer Maria Carrillo of the Alzheimer’s Association, which is pushing to add tau scans to other dementia research, too.

More than 35 million people worldwide have Alzheimer’s or similar dementias, including about 5 million in the U.S. Those numbers are expected to rise rapidly as the baby boomers get older. There is no good treatment. Today’s medications only temporarily ease symptoms and attempts at new drugs, mostly targeted at sticky amyloid, have failed in recent years.

Maybe that’s because treatment didn’t start early enough. Scientists now think Alzheimer’s begins quietly ravaging the brain more than a decade before symptoms appear, much like heart disease is triggered by gradual cholesterol buildup. Brain scans show many healthy older adults quietly harbor those sticky amyloid plaques, not a guarantee that they’ll eventually get Alzheimer’s but an increased risk.

Yet more recent research, including a large autopsy study from the Mayo Clinic, suggests that Alzheimer’s other bad actor — that tangle-forming tau protein — also plays a big role. The newest theory: Amyloid sparks a smoldering risk, but later spread of toxic tau speeds the brain destruction.

Normal tau acts sort of like railroad tracks to help nerve cells transport food and other molecules. But in Alzheimer’s, the protein’s strands collapse into tangles and eventually the cell dies. Most healthy people have a small amount of dysfunctional tau in one part of the brain by their 70s, Sperling said. But amyloid plaques somehow encourage this bad tau to spread toward the brain’s memory center, she explained.

The A4 study, which is enrolling participants in the U.S., Australia and Canada, may give some clues.

The goal is to check up to 500 people for tau three times over the three-year study, as researchers tease out when and how it forms in those who are still healthy. They won’t be told the results — scientists don’t know enough yet about what the scans portend.

At the same time, study participants will receive either an experimental anti-amyloid drug — Eli Lilly & Co.’s solanezumab — or a placebo as researchers track their memory. The $140 million study is funded by the National Institutes of Health, Lilly and others; the Alzheimer’s Association helped fund the addition of the tau scans.

The idea: If the drug proves to be helpful, it might be tamping down amyloid formation that in turn reins in toxic tau. In previous studies, solanezumab failed to help full-blown Alzheimer’s but appeared to slow mental decline in patients with mild disease, raising interest in testing the still healthy.

“We’re trying to remove amyloid’s downstream effects on tau formation,” said Dr. R. Scott Turner of Georgetown University Medical Center, where Gilbert enrolled in the study.

Seeing how amyloid and tau interact in living brains “is opening a whole new chapter into possible therapies,” Turner added.

For Gilbert, learning she had amyloid buildup “was distressing,” but it has prompted her to take extra steps, in addition to the study, to protect her brain. On her doctor’s advice, she’s exercising more, and exercising her brain in a new way by buying a keyboard to start piano lessons.

“It’s exciting to be part of something that’s cutting edge,” said Gilbert, who had never heard of tau before.

And she has a spot-on question: “So what’s the medication for the tau?”

Stay tuned: A handful of drugs to target tau also are in development but testing will take several years.

___

Online: www.a4study.org

Copyright 2015 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.

Activism

Diabetes in Black California: Turning the Tide from Crisis to Control

According to the Centers for Disease Control and Prevention (CDC) Behavioral Risk Factor Surveillance System data, nearly 17.9% of Black adults in California have been diagnosed with diabetes — above the national Black adult average of 16.8%, and nearly five points higher than California’s overall adult rate of 12.6% across all races. California ranks 24th out of 39 states with available data for Black adult diabetes rates.

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Dr. Khadijah Lang is a family physician with a clinic in Los Angeles who specializes in several family medical practices, including prenatal care. Lang believes in family medicine. She says it is important to treat all members of a family. Thursday, June 5, 2026. Photo by Solomon O. Smith/California Black Media.
Dr. Khadijah Lang is a family physician with a clinic in Los Angeles who specializes in several family medical practices, including prenatal care. Lang believes in family medicine. She says it is important to treat all members of a family. Thursday, June 5, 2026. Photo by Solomon O. Smith/California Black Media.

By Charlene Muhammad, California Black Media

Crystal Lambert knew something was terribly wrong with her three-year-old granddaughter as she sped down the street trying to get her to the hospital.

“I thought she got a hold of some poison,” Lambert recalled.

Doctors found Lambert’s granddaughter had a blood sugar level over 800, diagnosing her with Diabetic Ketoacidosis(DKA), a state in which the body, starved of insulin, begins to shut down.

Lambert said she was born with a pancreas that was not fully functioning — it lacked the specialized cells required to produce insulin.

Her granddaughter survived and is five years old today.  Now, she gives herself insulin shots, asks endless questions about her condition, and runs like the spirited child she is. But the terror of that night transformed Lambert — and ultimately inspired her to launch the We Fight Back Organization, a mobile health and food access initiative serving underserved communities across California. Lambert is the executive director.

The Crisis by the Numbers

According to the Centers for Disease Control and Prevention (CDC) Behavioral Risk Factor Surveillance System data, nearly 17.9% of Black adults in California have been diagnosed with diabetes — above the national Black adult average of 16.8%, and nearly five points higher than California’s overall adult rate of 12.6% across all races. California ranks 24th out of 39 states with available data for Black adult diabetes rates.

Nationally, according to the U.S. Department of Health and Human Services, Black Americans were 24% more likely than the overall U.S. population to have diabetes in 2024. They also died from diabetes 78% more often than the general population in 2022. Black Americans are also more than twice as likely as the overall population to develop kidney failure caused by diabetes.

According to the California Health Care Foundation’s 2024 Health Disparities Almanac, Black Californians have the shortest life expectancy in the state at just 74.6 years — due in part to chronic conditions like diabetes and its devastating complications.

Leon Rock, co-founder of the African American Diabetes Association, believes statistics, though revealing, only tell part of the story.

“There are a whole bunch of Black folks that don’t tell you that they have diabetes — or don’t know,” he said.

And the disease itself, Rock is careful to note, is not what kills. “They die from the complications. That’s heart attack, that’s stroke, that’s amputations of legs, of feet. Going blind. All those complications are inherent in a system that has impacted Black folks with diabetes in California and across America.”

Crystal Lambert, creator and executive director of We Fight Back. She started the organization out of a need to learn more about diabetes on behalf of her granddaughter. Now she is looking to spread the impact of her organization to the valley. Friday, June 6, 2026. Photo by Solomon O. Smith/California Black Media.

Crystal Lambert, creator and executive director of the We Fight Back Organization, started out of a need to learn more about diabetes on behalf of her granddaughter. Now she is looking to spread her organization to the valley, on Friday, June 6, 2026 Photo by Solomon O. Smith/ California Black Media

An Information Gap Fuels the Crisis

For Rock, part of the solution is diagnosis. He says the medical and public health systems are failing Black Californians by the absence of information designed for them.

“That is the bottom line. We need good information. Information that is culturally specific,” said Rock.

Telling people to eat healthy or exercise, he added, falls short when culturally specific alternatives are not provided, and when many residents of urban communities do not feel safe exercising in some neighborhoods – or outside at night.

Dr. Khadijah Lang, a family medicine physician and president of the Golden State Medical Association, agrees that the roots of the crisis run deeper than individual behavior — and blaming patients misses the point.

“We are not genetically predisposed to diabetes,” Lang said. “But the system under which we live increases the likelihood that we will develop it.” 

What the Body Needs — What Communities Are Denied

Type 2 diabetes, which accounts for 90 to 95% of all diabetes cases, according to the CDC, develops when the body can no longer use insulin effectively to regulate blood sugar. Left unmanaged, it damages nerves, kidneys, eyes, and the cardiovascular system. The hemoglobin A1C test is a blood draw that reveals how the body has processed sugar over the previous three months — not just at the moment of the test. It is the standard tool for both diagnosis and ongoing monitoring.

That distinction matters, Lang emphasized, because patients cannot manipulate three months of blood sugar history the way they might fast for a day before a single blood draw.

“The pill is not meant to undo or control a sugar level that’s being constantly stressed,” Lang said. “It’s meant to work in conjunction with a low-carbohydrate diet and exercise.” She recommended at minimum 30 minutes of physical activity five days a week — breakable into 10-minute sessions for those who need it.

Lang stressed that education must be delivered in language people recognize and can relate to. The goal is to inform them of the choices that serve their health best, she said.

But for many Black Californians, even those informed choices remain out of reach, Lambert said.

“They need access to healthy foods and medication, too” she said.

California has made some critical policy advances. The state has expanded access to the Continuous Glucose Monitor (CGM), which has transformed diabetes care for state residents. Assembly Bill 365, introduced in 2024, proposed requiring Medi-Cal to cover the costs of CGM and other related medical equipment but it failed in the State Senate. Since then, the California Department of Health Care Services (DHCS) reports that the core Medi-Cal CGM benefit now available to eligible patients was solidified through previous budget actions and pharmacy policy updates.

These measures, while meaningful, have not closed the gap for the communities most at risk, according to advocates.

Control Through Community

Health care advocates conclude that the solution must be communal, culturally grounded, and sustained — not a fad, not a celebrity moment, not a single clinic visit. For example, observed Lang, lifestyle shaped by shared values and collective accountability can move the needle where individual prescriptions have not.

Rock is building infrastructure to match the urgency, establishing local chapters of the African American Diabetes Association across the country, with California next.

“We have to do for self, period,” he said. “Health is wealth. We have to eat to live.”

And Lambert, whose granddaughter unknowingly started all of this for her, keeps showing up.

“Diabetes advocacy is about dignity, education, prevention, and hope,” she said.

Video: Diabetes Disparity Exposed in California

This article is supported by the California Health Care Foundation 

(CHCF). Visit www.chcf.org 

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Commentary

Doctors Seeing More Cases of Preventable Childhood Illnesses

OAKLAND POST — Physicians have said vaccine skepticism has expanded beyond childhood immunizations. Doctors also reported growing resistance to other preventive treatments.

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By Stacy M. Brown

Doctors across the United States say they are treating children for illnesses that routine vaccinations once made increasingly uncommon, raising concerns that years of declining immunization rates are beginning to reverse decades of public health progress.

Pediatricians have described seeing more cases of whooping cough, rotavirus infections, bacterial pneumonia and other potentially life-threatening illnesses that vaccines have long helped suppress. Some physicians reported treating conditions they had rarely encountered during their careers, while others said that growing vaccine hesitancy is changing how emergency rooms and hospitals care for children.

The reports come as measles outbreaks continue to spread across multiple states and vaccination coverage remains below federal public health targets.

Johns Hopkins University’s International Vaccine Access Center reported 2,077 confirmed measles cases nationwide as of May 29. Researchers warned that outbreaks reported across the country have raised concerns about continued transmission, additional hospitalizations and deaths, and the possible loss of the nation’s measles elimination status.

Public health experts have long viewed measles as a warning sign because of its ability to spread rapidly through communities with lower vaccination coverage. The New York Times reported that physicians increasingly fear the resurgence of measles may be followed by the return of other vaccine-preventable diseases.

Doctors say that is already happening.

Dr. Meghan Hofto, a pediatric hospitalist at the University of Alabama at Birmingham, said she has already treated roughly as many children with rotavirus this year as she saw during the previous decade. Rotavirus once caused tens of thousands of hospitalizations annually before vaccines sharply reduced its spread. None of the children she treated this year had been vaccinated.

Hofto also described caring for infants with pertussis, commonly known as whooping cough.

“It’s hard to know when they’re safe to go home,” Hofto told The Times.

The rise in whooping cough cases has been particularly striking. More than 28,000 cases were reported nationwide last year, compared with approximately 7,000 in 2023, according to figures cited by The Times. Many of the affected infants were too young to receive vaccinations themselves and relied on broader community protection to reduce their exposure.

Other doctors described similarly troubling cases.

Dr. Jessica Kirk, a pediatric hospitalist in Alabama, recently treated an unvaccinated toddler hospitalized with pneumonia caused by simultaneous infections of Haemophilus influenzae and Streptococcus pneumoniae. Vaccines exist to protect against both illnesses. The child required oxygen and antibiotics to recover.

Researchers at Johns Hopkins have been tracking vaccination trends nationwide and found continuing signs of vulnerability.

At the same time, vaccine policy has become increasingly contentious in state legislatures.

Johns Hopkins researchers reported that lawmakers across the country continue to introduce bills affecting childhood vaccination requirements, vaccine access and non-medical exemptions. Researchers also noted that state policies governing exemptions remain a significant factor in vaccination coverage and disease transmission risks.

Physicians have said vaccine skepticism has expanded beyond childhood immunizations. Doctors also reported growing resistance to other preventive treatments.

For doctors confronting the return of illnesses that vaccines once pushed to the margins of American medicine, the challenge is becoming increasingly personal.

“It just feels like you’re a tiny little boat with a giant tidal wave coming at you,” Dr. Erin Charles, a regional pediatric hospitalist at Seattle Children’s Hospital, told reporters. “And you might convince one family here and there.”

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Community

Asm. Isaac Bryan’s Environmental Reparations Bill Passes on Assembly Floor

“All this bill does is allocate resources from that repair fund and direct cash assistance to families that have had negative health impacts as a result of living next to that oil field,” said Bryan during remarks on the Assembly floor.

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Asm. Isaac Bryan (D-Ladera Heights). File photo.

By Bo Tefu, California Black Media

On May 26, the California State Assembly passed legislation to provide direct financial assistance to families harmed by pollution from a major urban oil field in South Los Angeles.

Assembly Bill (AB) 1661, introduced by Assemblymember Isaac Bryan (D-Ladera Heights), cleared the Assembly floor with a 44-10 vote after lawmakers concluded debate on the measure.

The bill would direct money from a community repair fund toward families who suffered negative health effects from living near what Bryan described as the state’s largest toxic urban oil field. The repair fund was created under legislation approved two years ago that shut down the oil field and required polluters to contribute financially to community recovery efforts.

“All this bill does is allocate resources from that repair fund and direct cash assistance to families that have had negative health impacts as a result of living next to that oil field,” said Bryan during remarks on the Assembly floor.

Bryan called the proposal “the largest environmental reparations opportunity for South LA” and told lawmakers the bill had not received opposition during the legislative process.

The legislation is part of California’s broader push to address environmental justice concerns in communities historically exposed to industrial pollution. South Los Angeles residents and environmental advocates have long raised concerns about health risks associated with oil drilling operations near homes, schools and parks.

Supporters say the measure represents a new approach to environmental accountability by ensuring that communities affected by pollution directly benefit from funds collected from responsible companies.

After debate concluded, Assembly leadership opened the roll call vote, and the measure passed with majority support from lawmakers.

AB 1661 now moves to the Senate for further review.

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