My point is that nobody on this forum in a world authority in human nutrition. Many consider they are expert re nutrition for bodybuilding. However, I doubt much is really known about this area because it has not been studied independently because there is little academic interest in bodybuilders. The supplement companies are keenly interested and have sponsored some research but that is not what I call independent research.
Usually,we have to extrapolate from nutrition studies with athletes and/or the general population. Almost nothing is known about the nutritional needs of professional and amateur bodybuilders.
Your last statement is not true at all.
http://jap.physiology.org/cgi/content/abstract/73/2/767Journal of Applied Physiology, Vol 73, Issue 2 767-775, Copyright © 1992 by American Physiological Society
ARTICLES
Protein requirements and muscle mass/strength changes during intensive training in novice bodybuildersP. W. Lemon, M. A. Tarnopolsky, J. D. MacDougall and S. A. Atkinson
School of Biomedical Sciences, Kent State University, Ohio 44242.
This randomized double-blind cross-over study assessed protein (PRO) requirements during the early stages of intensive bodybuilding training and determined whether supplemental PRO intake (PROIN) enhanced muscle mass/strength gains. Twelve men [22.4 +/- 2.4 (SD) yr] received an isoenergetic PRO (total PROIN 2.62 g.kg-1.day-1) or carbohydrate (CHO; total PROIN 1.35 g.kg-1.day-1) supplement for 1 mo each during intensive (1.5 h/day, 6 days/wk) weight training. On the basis of 3-day nitrogen balance (NBAL) measurements after 3.5 wk on each treatment (8.9 +/- 4.2 and -3.4 +/- 1.9 g N/day, respectively), the PROIN necessary for zero NBAL (requirement) was 1.4-1.5 g.kg-1.day-1. The recommended intake (requirement + 2 SD) was 1.6-1.7 g.kg-1.day-1.
However, strength (voluntary and electrically evoked) and muscle mass [density, creatinine excretion, muscle area (computer axial tomography scan), and biceps N content] gains were not different between diet treatments. These data indicate that, during the early stages of intensive bodybuilding training, PRO needs are approximately 100% greater than current recommendations but that PROIN
increases from 1.35 to 2.62 g.kg-1.day-1 do not enhance muscle mass/strength gains, at least during the 1st mo of training. Whether differential gains would occur with longer training remains to be determined.