Last updated: October 23, 2026.
This guide collects the brain and mental health studies covered on Nexo Science, grouped by topic. Each link goes to a full article about one peer-reviewed paper: what was found, how strong the evidence is and what is still uncertain.
Most of these results come from observational studies or meta-analyses, which show associations rather than proof of cause. None of this replaces advice from your doctor. We update this page as new studies come out.
Dementia and Alzheimer’s risk
- Moderate Drinking Could Lower Your Alzheimer’s Risk, According to the Largest Meta-Analysis Ever Done on Alcohol and Dementia
The largest meta-analysis on alcohol and dementia links moderate drinking to a lower Alzheimer’s risk. - Following a Mediterranean Diet Is Linked to a 30% Lower Risk of Alzheimer’s, a New Meta-Analysis Finds
A new meta-analysis ties a Mediterranean diet to a 30% lower risk of Alzheimer’s. - Brain scans catch a link to ultra-processed food that memory tests miss
Brain scans picked up a link to ultra-processed food that standard memory tests missed. - Vitamin D Might Matter More for Your Brain Than Your Bones
Vitamin D may matter more for the brain than for the bones it is known for. - Here’s What May Happen to Your Brain When Magnesium Runs Too Low or Too High
What may happen to the brain when magnesium levels run too low or too high.
Memory, focus and creativity
- Exercise Improves Your Memory and Focus, and It Doesn’t Need to Be Intense: The Largest Scientific Review Ever Done Confirms It
The largest review on the topic finds exercise improves memory and focus, even at low intensity. - Science Says a Short Walk Could Make You More Creative Than 80% of People Who Stay Seated
A short walk could make you more creative than 80% of people who stay seated. - Here’s What Probiotics Might Actually Be Doing to Your Memory
What probiotics might actually be doing to your memory. - Matcha Left Memory Unchanged, But Changed Something Else in the Brain
Matcha left memory unchanged, but changed something else in the brain.
Mood, sleep and headaches
- Short-Form Videos Like TikTok or Reels Are Linked to More Anxiety and Depression, But the Largest Meta-Analysis Yet Says the Problem Isn’t Time, It’s Dependency
Short videos are linked to more anxiety and depression; the problem seems to be dependency, not time. - Fiber From Food vs. Fiber Pills: Only One Seems to Help Your Mood
Fiber from food seemed to help mood; fiber pills did not. - Can Eating Nuts Every Week Actually Keep Depression Away?
Can a weekly handful of nuts keep depression away? What the data show. - Sleeping Less Than 7 Hours Raises Your Risk of Dying by 14%, But Sleeping More Than 9 Raises It by 34%, According to the Largest Meta-Analysis Ever Done
Sleeping under 7 hours raises the risk of dying by 14%; sleeping over 9 hours, by 34%. - Your Headache Medicine Could Be the Reason You Keep Getting Headaches, a Study of 2.9 Billion People Finds
A study covering 2.9 billion people suggests headache medicine itself can keep headaches coming.
Neurological disease and brain research
- Fecal Transplants Were Tested as a Parkinson’s Treatment: Here’s What the Science Has Found So Far
Fecal transplants have been tested against Parkinson’s: what the science has found so far. - Multiple Sclerosis: Why Fish Might Slow Down Disability
Why eating fish might slow disability in multiple sclerosis. - Port-Wine Birthmarks: The Forehead, Not the Nerve Map, Predicts a Baby’s Risk of a Rare Brain Disorder
In babies with port-wine birthmarks, the forehead predicts the risk of a rare brain disorder. - Human brain organoids in mice: lab-grown tissue filled a missing cortex and started firing together
Lab-grown human brain tissue filled a missing cortex in mice and started firing together. - Bigger Brains, Longer Childhoods: What Animal Parenting Reveals About Intelligence
Animal parenting suggests bigger brains go hand in hand with longer childhoods.