#227 - AMA #40: Body composition, protein, time-restricted feeding, fasting, DEXA scans, and more
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Oct 17, 2022
Discover the secrets of body composition as Peter explains how to interpret DEXA scan results, revealing metrics like lean muscle mass and bone density. Get insights into dietary protein needs and the optimal timing for intake to maximize muscle growth. Explore the benefits of time-restricted feeding and fasting, alongside evolving personal recommendations. Real patient case studies illustrate these concepts, shedding light on practical applications for improved health.
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Interpreting DEXA Scans
Obtain four key pieces of information from a DEXA scan: bone mineral density (BMD), visceral adipose tissue (VAT), and appendicular lean mass index (ALMI) or fat-free mass index (FFMI).
These metrics provide a comprehensive assessment of your body composition and bone health.
insights INSIGHT
DEXA Scan Safety
DEXA scans use very low-dose x-rays to differentiate bone, fat, and lean tissue.
The radiation exposure is minimal, comparable to a short flight, making it a safe procedure.
volunteer_activism ADVICE
DEXA Scan Frequency
Don't get DEXA scans too frequently; once or twice a year is sufficient.
Compare your results to age- and sex-matched norms to understand your individual standing.
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In this “Ask Me Anything” (AMA) episode, Peter discusses the importance of understanding body composition and explains how to interpret the most important metrics revealed by a DEXA scan, such as lean muscle tissue mass, visceral adiposity tissue mass, bone mineral density, and more. He discusses common concerning trends in these metrics as well as strategies to address them. He goes through DEXA scan results of both male and female patient case studies and explains the prescribed intervention for each patient. Additionally, Peter answers numerous questions about dietary protein including how much we need, when we need it, and how intake should be divided throughout the day to optimize muscle protein synthesis. Finally, Peter provides his updated point of view on time-restricted feeding and fasting and how his personal approach and recommendations for patients has evolved.
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We discuss:
Interpreting DEXA scans: important metrics, radiation levels, and more [2:15];
The Peter Attia Drive