Unfortunately, there haven't been any studies done on bodybuilders to prove the notion that constant grazing isn't beneficial.
Some interesting things to read though:
Iwao and colleagues examined boxers who were subjected to a hypocaloric diet while either consuming two or six meals per day. The study lasted for two weeks and the participants consumed 1,200 kcals per day. At the conclusion of the study, overall weight loss was not significantly different between the groups. However, individuals that consumed 6 meals per day had significantly less loss of lean body mass and urinary 3-methylhistidine/creatinine as opposed to those that only consumed two meals. This would suggest that an increased meal frequency under hypocaloric conditions may have an anti-catabolic effect.
Iwao S, Mori K, Sato Y: Effects of meal frequency on body composition during weight control in boxers.
Scand J Med Sci Sports 1996, 6(5):265-72.
A published abstract by Benardot et al. demonstrated that when a 250 calorie snack was given to 60 male and female college athletes for two weeks after breakfast, lunch, and dinner, as opposed to a non-caloric placebo, a significant amount of fat (-1.03%) was lost and lean body mass (+1.2 kg) gained. Furthermore, a significant increase in anaerobic power and energy output was observed via a 30-second Wingate test in those that consumed the 250 calorie snack. Conversely, no significant changes were observed in those consuming the non-caloric placebo. Interestingly, when individuals consumed the total snacks of 750 kcals a day, they only had a non-significant increase in total daily caloric consumption of 128 kcals [49]. In other words, they concomitantly ate fewer calories at each meal. Lastly, when the 250 kcal snacks were removed, the aforementioned values moved back to baseline levels 4 weeks later.
Benardot D, Martin DE, Thompson WR, Roman SB: Between-meal energy intake effects on body composition, performance, and total caloric consumption in athletes.
Medicine and Science in Sports and Exercise 2005, 37(5):S339.
And an excerpt from a pretty long article:
The time course of mps in response to a meal and the
refractory nature of mps in response to constant elevations in
amino acids make it seem unlikely that an additional
stimulation can be achieved 3 hours post prandially with a
second meal of similar composition to the first, as plasma
leucine concentrations remain peaked. Thus, in order to
avoid refractoriness and maximize mps it may be best to
consume larger doses of protein
that contain sufficient leucine to
maximize mtor signalling and mps
while allowing enough time (4-6
hours) for post prandial amino acid
levels to fall in between meals in
order to re-sensitize the system.
According to the protein stat
theory, a second nutritional
intervention which may overcome
refractoriness is to create a
supraphysiological rise in plasma
amino acid levels between meals.
A free form amino acid supplement
would likely be rapidly digested
and empty into the bloodstream
quickly, potentially elevating plasma amino acid levels
above their meal induced plateau. Finally, it may also be
advantageous to consume a carbohydrate source between
high protein meals if insulin does in in fact play a role in mps
becoming refractory. Evidence for this was provided by,
Padden-Jones et al. (30) who demonstrated that consuming
30 grams of carbohydrates and 15 grams of free form
essential amino acid supplement containing ~3g of leucine in between meals spaced 5 hours apart enhanced mps
compared to unsupplemented subjects fed the same meals.
This suggests that supplemental free form amino acids and
carbohydrates may either enhance the anabolic response
to a meal or somehow overcome the refractory response.
The potential of free form amino acid supplements and
carbohydrate ingestion between meals to overcome
refractoriness is a future focus of our lab's research. Athletes are more active and have very different goals
with regards to nutrition compared to the average person.
Athletes looking to maximize muscle mass and strength
may benefit from protein levels well above the RDA. While
the RDA focuses on minimum needs to achieve nitrogen
balance, athletes should focus on consuming sufficient
protein to maximize beneficial metabolic outcomes of
greater protein intakes on a meal to meal basis. Current
research suggests that the amino acid leucine is
responsible for much of the anabolic properties of a meal
and maximization of mps in response to a meal is
dependent upon consuming sufficient leucine (3g or
~0.05g/kg bodyweight) to saturate the mtor signalling
pathway. The amount of protein required at a meal to
achieve this outcome will differ based on the leucine
content of the protein source with leucine rich protein
sources like dairy, egg, meats and poultry being preferable
to leucine poor sources of protein such as wheat. These
leucine rich meals should be consumed multiple times per
day and consumption of carbohydrate with free form
essential amino acids ingested between whole protein
meals may further optimize mps, possibly by overcoming
refractoriness.
http://www.biolayne.com/wp-content/u...-Tech-2008.pdf
^ The supporting studies are noted and referenced in the article.
OP, evidence suggests your carb intake is beneficial, as is your "grazing". If you can't afford all the meat, protein supps are "necessary". You're doing it right.