The Century Project (v.110): Muscle Recovery – Protein Intake

Research evidence excerpt

The Century Project (v.110): Muscle Recovery – Protein Intake

Longevity and Healthspan July 7, 2026

Insights from the office of

Stefano Natella The Century Project (v.110): Muscle Recovery –

Head of Equities Protein Intake stefano.natella@guggenheimpartners.com

212 518 9806

In this series, The Century Project—part of the Innovation and Entrepreneurship

With contributions by platform at Guggenheim Securities—we cover one of the most debated topics

Vamil Divan, M.D. in modern medicine: Aging. We analyze more than 60 different factors that can

vamil.divan@guggenheimpartners.com influence our potential longevity, and particularly our healthspan, defined as the 212 823 6543 period of time that we live free of any chronic disease.

Protein intake is probably the most important element supporting muscle repair and

regeneration following intense and extensive exercise. Autophagy and nitric oxide

synthesis—we covered both in the last two issues—improve the efficiency of the process

of muscle repair; protein intake helps stimulate muscle protein synthesis and provides

the building blocks of this process. Several studies show that the rate of muscle protein

synthesis is a function of exercise intensity and duration as well as the level of protein

intake. Luckily, the process of muscle protein synthesis associated with protein intake

can be measured quite precisely through muscle biopsies, allowing for proper testing

of different combinations of dose, frequency and timing. Highly reliable research in this

field suggests that taking 20 g (0.7 ounces) of protein every 3 hours—with the first 20

g consumed within an hour post-exercise—achieves the highest rate of muscle protein

synthesis and thus the fastest muscle recovery following an intense exercise bout.