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Eating Most Calories Early in the Day Doesn’t Impact Weight Loss

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Restricting meals to early in the day did not affect weight among overweight adults with prediabetes or diabetes, according to preliminary research to be presented at the American Heart Association’s Scientific Sessions 2020. The meeting will be held virtually, Friday, November 13 – Tuesday, November 17, 2020, and is a premier global exchange of the latest scientific advancements, research and evidence-based clinical practice updates in cardiovascular science for health care worldwide.

Credit: American Heart Association
“We have wondered for a long time if when one eats during the day affects the way the body uses and stores energy,” said study author Nisa M. Maruthur, M.D., M.H.S., associate professor of medicine, epidemiology and nursing at Johns Hopkins University in Baltimore. “Most prior studies have not controlled the number of calories, so it wasn’t clear if people who ate earlier just ate fewer calories. In this study, the only thing we changed was the time of day of eating.”

Maruthur and colleagues followed 41 overweight adults in a 12-week study. Most participants (90%) were Black women with prediabetes or diabetes, and average age of 59 years. Twenty-one of the adults followed a time-restricted eating pattern, limiting eating to specific hours of the day and ate 80% of their calories before 1 p.m. The remaining 20 participants ate at usual times during a 12-hour window, consuming half of their daily calories after 5 p.m. for the entire 12 weeks. All participants consumed the same pre-prepared, healthy meals provided for the study. Weight and blood pressure were measured at the beginning of the study; then at 4 weeks, 8 weeks and 12 weeks.

The analysis found that people in both groups lost weight and had decreased blood pressure regardless of when they ate.

“We thought that the time-restricted group would lose more weight,” Maruthur said. “Yet that didn’t happen. We did not see any difference in weight loss for those who ate most of their calories earlier versus later in the day. We did not see any effects on blood pressure either.”

The researchers are now collecting more detailed information on blood pressure recorded over 24 hours, and they will be compiling this information with the results of a study on the effects of time-restricted feeding on blood sugar, insulin and other hormones.

“Together, these findings will help us to more fully understand the effects of time-restricted eating on cardiometabolic health,” Maruthur said. Co-authors are Scott Pilla, M.D., M.H.S.; May T.T. Maw, M.B.B.S.M., M.P.H.; Daisy Duan, M.D.; Di Zhao, Ph.D.; Eliseo Guallar, M.D., Dr. P.H.; Ruth Alma Turkson Ocran, Ph.D.; Karen White, M.S.; Beiwen Wu, M.S.P.H.; Jeanne Charleston, R.N.; Lawrence J. Appel, M.D., M.P.H.; and Jeanne M. Clark, M.D., M.P.H. Author disclosures are in the abstract. The study was funded by a grant from the American Heart Association.

Note: Session: LF.APS.04; Scientific presentation is 9 a.m. CT, Friday, Nov. 13, 2020.

 

Contacts and sources:
American Heart Association
 

  



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