High Protein Diet

It is shown that the high protein Diet is as bad as smoking for middle-aged people.

In humans, some studies have shown that dietary protein digestion and absorption kinetics are not impaired in vivo in healthy, elderly men. However, these studies have also reported increased splanchnic extraction of amino acids, which might result in decreased availability to peripheral tissues, and speculated that in the case of low protein intake or increased protein requirement, the limited systemic availability of dietary amino acids may contribute to decreased muscle protein synthesis (Boirie et al., 1997; Koopman et al., 2009).

Morgan E. Levine et al., 2014, Low Protein Intake Is Associated with a Major Reduction in IGF-1, Cancer, and Overall Mortality Reduction in IGF-1, Cancer, and Overall Mortality, Cell metabolism  (volume 19 issue 3 pp.407 – 417)