A new study from the University of Southern California suggests that a Mediterranean inspired diet rich in plants and fish, when paired with small amounts of the amino acid methionine, can extend healthy lifespan and reduce frailty in mice. The researchers found that this combination promoted longevity and decreased fat mass compared to standard diets. The findings were published in the journal Cell Metabolism.

The study indicates that adding methionine, an amino acid commonly found in eggs, meat and dairy, to a low-protein, plant based diet may counteract some of the drawbacks of extreme protein restriction while preserving its longevity benefits. The approach appeared to improve metabolic health and reduce markers of aging in the mice.

Key takeaways

  • A plant and fish based low-protein diet with added methionine extended healthy lifespan in mice.
  • The diet reduced frailty and decreased fat mass compared to standard mouse chow.
  • Methionine supplementation may offset risks of very low protein intake while maintaining longevity benefits.

Study details and design

Researchers at the USC Leonard Davis School of Gerontology fed mice a diet modeled after the Mediterranean eating pattern, which is rich in vegetables, fruits, whole grains and fish but low in red meat and processed foods. This diet contained about 10 percent of calories from protein, which is lower than typical mouse chow. One group received this low-protein diet alone, while another received the same diet supplemented with a small amount of methionine.

Methionine is an essential amino acid that plays key roles in metabolism and protein synthesis. It is abundant in animal-based foods like eggs, meat and dairy. The researchers added it at a level that brought the total methionine intake to roughly the same as that of a standard diet.

Results: Longer life, less frailty

Mice on the Mediterranean style diet with added methionine lived significantly longer than those on the standard diet. They also showed lower levels of frailty, as measured by grip strength, walking speed and other physical assessments. Fat mass decreased in these mice, even though they consumed similar amounts of calories as the control group.

According to the original report from Medical Xpress, the researchers noted that the diet appeared to improve metabolic markers, including blood sugar regulation and inflammation. The mice also maintained lean muscle mass better than those on the low-protein diet without added methionine.

Why this matters

The study adds to a growing body of evidence that dietary composition, not just calorie restriction, influences aging. Previous research has shown that low-protein diets can extend lifespan in animals, but they may also lead to muscle loss and other issues. Adding methionine may help balance these effects, the researchers suggested.

The findings do not prove that the same diet would work in humans. Mice have different metabolisms, and dietary studies in humans are more complex. However, the results offer a new avenue for exploring how specific amino acids interact with overall dietary patterns to affect healthspan, the period of life spent in good health.

Frequently Asked Questions

What is methionine and where is it found?

Methionine is an essential amino acid that the body cannot produce on its own. It must be obtained from food. It is found in high amounts in eggs, meat, poultry, fish, dairy products, and some nuts and seeds. In this study, researchers added methionine to a low-protein diet at levels similar to a standard diet.

Does this mean I should add methionine to my diet?

No. This study was conducted in mice, not humans. The results are promising but preliminary. Consuming too much methionine may be harmful in humans, as it has been linked to increased risk of heart disease and other health issues. Always consult a healthcare provider before making significant dietary changes.

What is a Mediterranean style diet?

A Mediterranean diet emphasizes plant-based foods such as vegetables, fruits, whole grains, nuts, and legumes. It includes fish and poultry in moderation, and limits red meat and processed foods. Olive oil is the primary fat source. This eating pattern is often linked to better heart health and longevity.

This is an original report by Vital Signs Today, informed by reporting from Medical Xpress. Read the original source.

This article is for information only and is not medical advice. See our Medical Disclaimer.