Staying active is known to improve sleep, but the research findings are mixed regarding the best workout. Some studies say light walking or stretching is best, others prefer moderate-intensity workouts like jogging — and some even find that vigorous exercise such as swimming makes sleep worse.

Resolving this discrepancy is important because good sleep is known to reduce the risk of developing dementia. Many of the estimated 8 to 10 million older adults in the United States who live with mild cognitive impairment—which sometimes occurs before dementia — struggle to get a good night’s sleep. They tend to sleep about 34 minutes less per night than others, take longer to fall asleep and spend more time awake throughout the night.

Now, researchers with the Center for Community Health and Aging at the Texas A&M University School of Public Health have a clear answer to the exercise question: Both light and vigorous exercise can reduce sleep disturbances for older adults with mild cognitive impairment.

A study published in Current Developments in Nutrition shows that adopting a low-fat vegan diet reduces diet-related greenhouse gas emissions by 55% and cumulative energy demand by 44%—dramatic reductions achieved in just 12 weeks.

Small abnormalities in blood sugar, blood lipids and inflammation several years before pregnancy are linked to an increased risk of high blood pressure during pregnancy and pre-eclampsia, according to a new study from Karolinska Institutet published in JAMA Network Open. The findings may contribute to earlier risk assessment and preventive measures in antenatal care.