Even light alcohol consumption could have negative consequences for brain health, according to new research that challenges a long held belief about drinking. The findings raise questions about the familiar idea that a daily glass of wine may help keep dementia away.

The study was published in the Journal of the American Medical Association. Researchers found that consuming four drinks a week may be linked to smaller brain volume and declining language skills, suggesting possible risks even at levels often considered light drinking.

Scripps News Medical Contributor Dr. Omer Awan described the findings as nuanced. He stressed that the research does not establish alcohol as a direct cause of dementia, even as it points toward alcohol as one factor people may be able to modify.

Awan said, "It's not saying that alcohol causes dementia." He added, "That's an important point that I want viewers to understand."

The distinction is central to interpreting the research. According to Awan, alcohol is one among many modifiable factors that can elevate a person's risk of developing dementia, rather than a proven direct cause of the condition.

Research involving light and moderate alcohol consumption remains mixed, Awan said. At the same time, he said the available evidence is shifting as more findings point toward potential harm from drinking even relatively small amounts.

"There's a stronger and a growing body of evidence that now suggests that even small amounts of alcohol can harm you," Awan said.

That assessment challenges claims that drinking alcohol can improve health. Awan also noted that the American Public Health Association has clearly stated that alcohol provides no health benefits.

The concerns become greater as alcohol consumption rises. Heavy drinking, defined in the source as consuming more than two drinks a day, carries more substantial health risks than light or moderate drinking.

Awan described alcohol as a toxin that the body can metabolize into acetaldehyde. That substance can directly damage DNA, providing one explanation for the broad health concerns associated with heavier alcohol consumption.

Alcohol is linked to at least 7 cancers, according to Awan. The cancers identified in the report include breast, liver, and colon cancer, adding cancer risk to the concerns about possible effects on the brain.

Drinking can also induce inflammation and oxidative stress. In addition, alcohol can raise blood pressure and increase the risk of heart disease and stroke, expanding the potential consequences beyond brain health alone.

Alcohol can affect mental function and behavior as well. Awan said it can impair judgment, memory, and learning, concerns that accompany the study's findings involving smaller brain volume and declining language skills.

For people trying to decide how to respond, Awan offered a direct message based on the available evidence. "If you're not drinking already, I wouldn't start drinking."

He also rejected the idea that alcohol should be consumed for a possible health benefit. "There's no evidence to suggest that drinking alcohol can improve your health."

For those drinking heavily, Awan advised cutting back. "And if you're drinking heavily, you should consider drinking less," he said.

Awan encouraged people who are concerned about their alcohol consumption to speak with a doctor. A physician can help develop a plan aimed at reducing drinking over time rather than leaving people to navigate the issue without medical guidance.

The study does not prove that alcohol causes dementia, but it adds to evidence questioning whether any amount of drinking should be treated as beneficial. Its findings place even light consumption under greater scrutiny because four drinks a week may be associated with measurable differences in brain volume and language abilities.