We all know the importance of taking care of our bodies, but did you know that the drinks you sip on could be silently affecting your brain? The Alzheimer’s Association states that more than 7 million Americans today suffer from Alzheimer’s disease, a devastating neurodegenerative condition, and that number will climb as the population ages.
A study published in the American Journal of Clinical Nutrition suggests that our beverage choices may affect brain health and cognitive decline. Some everyday drinks loaded with sugar, artificial sweeteners, or alcohol might actually raise the risk for developing Alzheimer’s and other dementias.
Knowing which drinks to curb could help you protect your brain. Let’s take a look at 12 drinks that have been linked to a higher risk of Alzheimer’s disease.
Diet soda
Studies raise red flags for those who drink diet soda. A major 2025 study found that adults consuming the highest amounts of low- and no-calorie artificial sweeteners had a 62% faster decline in cognitive function over eight years — in other words, about 1.6 extra years of brain aging. In that same research, the effect was exceptionally robust among adults under age 60 and those with diabetes.
While this does not define causation, the association is significant. The sweeteners include aspartame, saccharin, and acesulfame‑K. Because diet sodas are a common go‑to for those avoiding sugar, these findings suggest that diet versions may not be so harmless when it comes to brain health.
Energy drinks
Energy drinks combine high caffeine, sugar, and often artificial additives-a combo not great for the brain. While specific large‑scale Alzheimer’s linkage data are more limited for energy drinks, the known effects of disrupted sleep, anxiety, inflammation, and sugar spikes all tie into cognitive decline pathways.
Sugar and additives in these beverages could also impair brain health by promoting inflammation and insulin resistance. Since quality of sleep is a known determining factor in the risk of Alzheimer’s, the amount of caffeine and stimulant load in energy drinks adds another layer of concern.
Alcohol (beer & wine)
It is time to take a fresh look at alcohol intake and its relation to the risk of dementia, including Alzheimer’s. A 2025 genetic study found that alcohol exposure, even at levels considered moderate, was associated with an elevated risk of dementia; no protective effect at low levels was identified.
Another recent analysis found that heavy drinking-eight or more drinks per week-was linked with 133% higher odds of vascular brain lesions associated with Alzheimer’s pathology.
Earlier preclinical work previously showed that even modest alcohol consumption accelerated brain atrophy and increased amyloid‐beta plaque accumulation in an Alzheimer’s model. So while that glass of wine might feel social and harmless, emerging evidence shows that any amount of alcohol can have possible risks to brain health over time.
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Fruit juices
Fruit juices often carry a “healthy” image, but when they are high in sugar, the risk signals rise. A study published in the Frontiers in Immunology shows that excessive juice consumption can spike insulin levels and trigger inflammatory responses — both of which are damaging to brain health.
In one observational study, high intake of sugar beverages — including juices — was associated with higher dementia risk. Considering that many store‑bought juices contain the sugar equivalent of sodas, drinking them frequently may undermine brain resilience.
Regular soda
Regular sugary sodas raise flags, too. Research in the National Institutes of Health showed that a larger intake of sugar in beverages is associated with an increased risk of incident dementia and Alzheimer’s disease. In one study, persons consuming one to seven servings of sugar‐sweetened beverages per week were 1.91 times more likely to develop Alzheimer’s compared to non‐consumers.
Those consuming more than seven servings had a 2.55 times higher risk. Other studies report that sugar‑sweetened drink consumption is associated with brain shrinkage and worse memory performance. Considering how often people drink soda in this country, that’s a serious problem that must be addressed.
Sweetened iced tea
Sweetened iced tea mixes sugar and caffeine, two ingredients considered stressful to the brain. Sugar can spur insulin resistance and inflammation, while caffeine can interfere with sleep or stress responses-the latter two linked to cognitive decline.
This compounding mix of sugar plus stimulant puts it in the risky category for brain health.
Flavored coffee drinks
Flavored coffee drinks have grown massively in popularity over the last decade. But many contain high sugar and artificial flavorings that can negate the natural brain benefits of plain coffee.
Research on sugar and artificial additives suggests they contribute to neural inflammation or metabolic stress. Whereas coffee itself was associated with brain benefits, these loaded versions may shift the balance toward harm.
Sports drinks
Sports drinks are promoted for hydration and athletic performance, but they frequently contain sugars, artificial sweeteners, colors, and additives. These substances might interfere with gut-brain communication, metabolic balance, and inflammation- all factors associated with cognitive decline.
Since brain health relies on pure metabolic function, using sports drinks regularly when heavy exercise is not involved could be an unnecessary risk.
Milkshakes
Milkshakes provide a double dose of saturated fat and sugar. Both heavy loads of fat and high sugar consumption are associated with obesity, insulin resistance, and inflammation-all known risk factors for Alzheimer’s disease.
BMC pointed out that high dietary sugar intake is associated with increased risk of Alzheimer’s and reduced brain volume. So while indulging occasionally may be okay, frequent milkshakes may erode brain health over time.
Pre‑mixed cocktails
Pre-mixed cocktails often pack alcohol, sugar, preservatives, and artificial flavours- a cocktail (literally) of risk factors for the brain. Alcohol raises dementia risk, sugar feeds inflammation and insulin resistance, and preservatives/additives may challenge neural health or gut-brain balance.
Considering all three together makes these drinks particularly concerning for long-term brain function.
Artificially flavored waters
Flavored waters are a healthier option than sodas, but many of them contain artificial sweeteners and additives. Recent research into artificial sweeteners has found that high consumption is associated with a dramatic rate of cognitive decline.
The ingredients they contain mirror those linked to brain aging. Checking labels and choosing clean hydration options may help preserve brain health.
Caffeinated sodas
Caffeinated sodas combine two problematic ingredients: sugar and caffeine. Sugar drives inflammation and insulin dysregulation; caffeine, according to ScienceDirect, can disrupt sleep, raise stress levels, and affect brain repair mechanisms.
Studies link sugary caffeinated drinks with worse memory performance and brain shrinkage. For those relying on caffeinated sodas—and many do in the U.S.—this may be an underrated threat to cognitive ageing.
Key takeaway
Your daily beverage choices are more important than you may think. Beverages high in sugar, artificial sweeteners, stimulants, or alcohol are associated with quicker cognitive decline, increased brain aging, and increased risk of Alzheimer’s.
Minimizing diet sodas, sugary sodas, alcohol, sweetened juices/teas, and other heavily processed drinks may help protect your brain. Instead, aim for water, unsweetened tea, plain coffee in moderation, and whole-food-based hydration. Your next drink is your brain’s best defense.
Disclaimer – This list is solely the author’s opinion based on research and publicly available information. It is not intended to be professional advice.
Disclosure: This article was developed with the assistance of AI and was subsequently reviewed, revised, and approved by our editorial team.
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