Dietary guidelines put to the test: does weight loss boost heart benefits?

NCT ID NCT04293224

Completed Knowledge-focused Sponsor: USDA, Western Human Nutrition Research Center Source: ClinicalTrials.gov ↗

First seen Jun 26, 2026 · Last updated Aug 04, 2026 · Updated 3 times

Summary

This study is testing whether following a Mediterranean-style diet based on U.S. dietary guidelines improves heart health more when combined with weight loss. Researchers will provide all meals for 70 adults with obesity or excess body fat for eight weeks. Participants will be split into groups: some will eat enough to maintain weight, while others will eat less to lose weight. The goal is to see if weight loss adds extra benefits for blood sugar, cholesterol, and blood pressure.

What this could mean

Our plain-language read of the trial. This is informational only — not medical advice or a prediction.

Active substance: Mediterranean diet pattern
What this could lead to: If successful, this could show that combining a healthy diet with weight loss is better for heart health than diet alone.
What could go wrong: This is a small, early-stage study (70 people) that only looks at short-term changes. Results may not apply to everyone, and the diet is provided, which may not reflect real-world eating habits.

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Conditions

The condition(s) this trial relates to.

Body Weight cardiovascular disorder Feeding Behavior glucose intolerance Insulin Resistance metabolic syndrome X Obesity obesity disorder prediabetes syndrome Prehypertension

As listed by the trial registrant

The condition terms exactly as the trial's registrant entered them.

BODY WEIGHT OBESITY

Contacts and locations

Locations

UC Davis, Western Human Nutrition Research Center

Davis, California, 95616, United States

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