More than 30% of adults over 70 have amyloid or tau (proteins implicated in the development of Alzheimer’s disease) in their brains yet have no apparent cognitive problems. This may indicate greater cognitive reserve, the brain’s ability to compensate for damage.
Neurogenesis is the birth of new nerve cells, called neurons, in the brain. The ability to grow new neurons appears more prominent in super-agers, people 80 and older whose thinking and memory skills are as sharp as adults who are decades younger.
A 2026 study found that sleeping 7.3 hours on weeknights may be associated with better blood sugar regulation by improving insulin sensitivity—how efficiently cells respond to insulin and absorb sugar from the bloodstream.
A 2026 study suggests that people who engage in spiritual practices and communities are significantly less likely than non-practitioners to misuse alcohol, tobacco, marijuana, and illicit drugs and better able to recover from substance abuse.
A 2026 study suggests that people who take GLP-1 drugs—prescribed for diabetes and weight loss—are less likely to develop a substance use disorder. Among people who already have addiction, use of a GLP-1 was linked with fewer complications such as overdose and death.
The glymphatic system serves as the brain’s cleanup crew. It promotes the circulation of cerebrospinal fluid through the brain during deep sleep, flushing away amyloid and other proteins that can lead to neurological conditions such as Alzheimer’s, Parkinson’s disease, and Lewy body dementia.
A 2026 study indicates a precipitous decline in the number of primary care providers in the United States accepting new patients. Without a primary care doctor, people are more vulnerable to serious medical problems and may have trouble getting regular tests and prescriptions.
Pregnancy complications such as gestational diabetes and preeclampsia—marked by high blood pressure that can impair organ function and affect blood vessels—are increasingly tied to higher lifetime cardiovascular risks. Women with these complications face greater odds of heart attack, stroke, and diabetes.
Revenge bedtime procrastination involves sacrificing sleep to prioritize personal time for activities unrelated to the demands of work or caregiving. Short-term effects of insufficient quality sleep time include next-day fatigue and negative mood. Persistent sleep deprivation can increase risks of conditions such as cardiovascular disease and dementia.