Three Studies Link Lifestyle Timing and Diet to Heart and Brain Health

Three separate studies published in recent days highlight how lifestyle factors—from meal timing to diet quality—affect cardiovascular and cognitive health across different life stages.

A study published Feb. 26 in the Canadian Journal of Cardiology reveals that younger heart patients face a double burden. They aren't just fighting for their own survival — they're also navigating the complex emotional and physical toll of parenting as patients. Early-onset heart disease — defined as occurring before age 55 in men and 65 in women — is on the rise. Global cases jumped from 1.5 million in 1990 to 2.6 million in 2019.

The 32 participants in the study were recruited from a large Canadian heart treatment center. All were over 18 and had been diagnosed with premature heart disease such as coronary artery disease, heart failure, spontaneous coronary artery dissection, stroke and cardiac arrhythmias. All were parenting at least one child under 18 years of age.

Based upon a 90-minute online focus group, researchers identified three major areas where parents could use more help from the health care system. Parents reported deep uncertainty about how much to tell their children about their heart event or diagnosis. Many downplayed the severity of their condition, because they were still processing the trauma themselves. Heart conditions often cause low energy and irritability, causing an identity shift for parents. Many mothers and fathers struggled to look normal on the outside while being unable to maintain the routine of household chores or the playtime as they once had. Survivors, especially mothers, often become hypervigilant about their children's health, sometimes unfairly restricting their kids' diets or activities out of a fear that they have passed on "bad genes."

Researchers have developed a new patient guide and an illustrated children's book, set for release in May 2026, to help families discuss heart health in a way kids can understand.

In a separate study, middle-aged people who eat healthy have a lower risk of brain decline in old age, researchers reported Feb. 23 in JAMA Neurology. The heart-healthy Dietary Approaches to Stop Hypertension (DASH) diet provided the best protection for brain health, but results showed that eating patterns aimed at lowering blood sugar or inflammation also lowered risk of cognitive decline.

For the study, researchers pooled data from three major studies tracking the lifetime health of nurses and health professionals. More than 159,000 people were included in this analysis. The research team scored each participant on how well their reported diet conformed to six different healthy eating patterns, including the DASH diet, the Healthful Plant-Based Diet Index, the Planetary Health Diet Index and the Alternate Healthy Eating Index 2010.

People whose eating pattern followed the DASH diet most closely had a 41% lower risk of brain decline, compared with those whose eating least followed DASH. In particular, a higher DASH diet score at ages 45 to 54 showed the strongest association with healthy brain aging. Other healthy diets also lowered the risk of brain decline by 24% to 11%.

Higher intake of vegetables, fish, and moderate wine consumption contributed to the observed associations, whereas red and processed meats, fried potatoes, and sugary beverages were associated with poorer cognition.

A third study found that dimming lights and avoiding food three hours before bed resulted in measurable gains in heart and metabolic markers during sleep and the entire next day, researchers reported Feb. 12 in the journal Arteriosclerosis, Thrombosis, and Vascular Biology. Significantly, study participants didn't cut calories. They simply changed how late in the evening they ate.

The study included 39 overweight or obese participants between 36 and 75 years of age. For 7-1/2 weeks, both groups turned down the lights three hours before bed. One group fasted 13 to 16 hours overnight. Another ate as usual.

Those who tweaked their timing had measurable improvements in key measures of heart health. Their nighttime blood pressure dropped 3.5%. Their heart rate dropped 5%. A stronger day-night rhythm is associated with better cardiovascular health. Daytime blood sugar control was also better among those who followed the new evening routine. When given glucose, their pancreas responded more effectively, suggesting improved insulin release and steadier blood sugar levels.