Associations between dietary intake and sarcopenia: a Mendelian randomization study

Area of Science:

• Nutritional Science
• Gerontology
• Genetics

Background:

• Sarcopenia, characterized by muscle mass and function decline, is a major health issue for the elderly.
• Dietary intake is a key modifiable factor for sarcopenia prevention and management.
• Understanding diet-gene interactions is crucial for developing effective interventions.

Purpose of the Study:

• To investigate the causal relationship between dietary intake and sarcopenia-related phenotypes using Mendelian randomization.
• To identify specific dietary components that may protect against sarcopenia.

Main Methods:

• Mendelian randomization (MR) analysis was employed.
• Genetic variants from the UK Biobank served as instrumental variables for 26 dietary elements.
• Sarcopenia phenotypes included appendicular lean mass (ALM), hand grip strength, and walking pace.

Main Results:

• Oily fish and cheese consumption showed significant positive associations with ALM, reduced risk of low hand grip strength, and improved walking pace.
• Cooked and raw vegetables, fresh and dried fruits, and cereals demonstrated protective effects against sarcopenia phenotypes.
• MR analysis results were robust against potential confounding factors.

Conclusions:

• Certain dietary components play a significant role in protecting against sarcopenia.
• Tailored nutritional strategies are essential for maintaining muscle health in older adults.
• Further research is needed to validate findings in diverse populations and explore biological mechanisms.