Plant Proteins Are the Rage Now - What You Need to Know

Mike T Nelson, CSCS, CISSN, MSME, PhD

Plant proteins have become more popular recently in part due to environmental concerns or ethical concerns (1, 2).  Is there any truth that plant-based proteins are better for the earth?   There is some data to support that claim but it is far from conclusive.  Pimentel et al. in 2003 (3) analyzed the land and energy resources devoted to an average meat-based diet compared with a lactoovovegetarian (plant-based) diet.  They found that both diets contained the same number of calories at 3,533 kcal per person.  According to their analysis:

  “The meat-based food system requires more energy, land, and water resources than the lactoovovegetarian diet. In this limited sense, the lactoovovegetarian diet is more sustainable than the average American meat-based diet.” (3). 

The Studies

In the USA, Europe, and Australia, meat and dairy provide about 80% of the daily protein intake compared to Africa where as little as 7 g of meat and 4 g of milk are consumed per capita (4).  In an analysis from 2014 (Scarborough et al., 2014), the researchers found that greenhouse gas emissions in self-selected meat-eaters was about twice as high as those in vegans.  They concluded that reductions in meat consumption could lead to reductions in greenhouse gas emissions. 

 

Again, this is far from a closed bookcase that plant proteins are superior for the environment and the analysis gets super complicated very fast.  However, if you opt to increase your use of plant protein, the next question is if you can get the same physiological response (aka gainZ bro)? 

 

A study by Yang et al. (5) compared the effects of whey and soy protein in older men (age 71 +/- 5 years). The subjects completed a single-leg extension exercise before taking either no protein or 20 grams of soy protein.  The researchers sampled the men’s muscle tissue via biopsy to compare the results to the non-exercising leg.  Yep, they jammed a large needle into their leg to pull out a chunk of muscle.   They found that consuming soy protein was better than nothing (shocker I know), but it did not match to the response of whey protein from previous studies (6).


What about plant protein compared to dairy sources?  In another study (7), wheat protein was compared to dairy protein sources in healthy older men (average age: 71 ± 1 years old).  The 60 subjects were split into 5 groups where they consumed 35 g wheat protein, 35 g wheat protein hydrolysate, 35 g micellar casein, 35 g whey protein, or 60 g wheat protein hydrolysate. Plasma and muscle samples were collected at regular intervals.  They found that a 60-gram dose of wheat protein was needed to see the same muscle protein synthetic (aka MPS also know as gainZ) response as the lower dose of 35 grams of the dairy-based proteins. (7).  If you are some oddball and trying to get all your protein from a wheat protein, back up the feedbag to the tune of twice the amount of protein you need to consume in one sitting to see the same effect for your muscles to recover. 

 

How about rice protein, which is a popular plant protein.  In a chronic study from Joy et al (8), subjects were given either 48 grams of rice protein as a supplement or 48 grams of whey protein isolate after exercise.   They did not see any difference between groups over 8 weeks at that dose (8).  This study provides data that while plant proteins tend to be inferior to dairy-based proteins on a gram-for-gram basis, that difference in MPS can be equalized at a higher intake dose.   In short, for rice protein, when you use a higher amount you can see a similar effect.

In Summary

Depending on the source of plant proteins used, you can still see a good effect on your gainZ if you got with a 40-50 gram dose.  The Driven Nutrition vegan plant-based protein is a great option if you are not including animal products in your diet.  It also has a complete amino acid profile providing enough essential amino acids and especially leucine at a dose of 2 scoops with 40 grams of protein.  Fuel up my vegan friends for the gainZ. 

References

1. Scarborough P, Appleby PN, Mizdrak A, Briggs AD, Travis RC, Bradbury KE, et al. Dietary greenhouse gas emissions of meat-eaters, fish-eaters, vegetarians and vegans in the UK. Climatic change. 2014;125(2):179-92.

2. Millward DJ, Garnett T. Plenary Lecture 3: Food and the planet: nutritional dilemmas of greenhouse gas emission reductions through reduced intakes of meat and dairy foods. The Proceedings of the Nutrition Society. 2010;69(1):103-18.

3. Pimentel D, Pimentel M. Sustainability of meat-based and plant-based diets and the environment. Am J Clin Nutr. 2003;78(3 Suppl):660s-3s.

4. Gorissen SHM, Witard OC. Characterising the muscle anabolic potential of dairy, meat and plant-based protein sources in older adults. The Proceedings of the Nutrition Society. 2018;77(1):20-31.

5. Yang Y, Churchward-Venne TA, Burd NA, Breen L, Tarnopolsky MA, Phillips SM. Myofibrillar protein synthesis following ingestion of soy protein isolate at rest and after resistance exercise in elderly men. Nutr Metab (Lond). 2012;9(1):57.

6. Tang JE, Moore DR, Kujbida GW, Tarnopolsky MA, Phillips SM. Ingestion of whey hydrolysate, casein, or soy protein isolate: effects on mixed muscle protein synthesis at rest and following resistance exercise in young men. J Appl Physiol (1985). 2009;107(3):987-92.

7. Gorissen SH, Horstman AM, Franssen R, Crombag JJ, Langer H, Bierau J, et al. Ingestion of Wheat Protein Increases In Vivo Muscle Protein Synthesis Rates in Healthy Older Men in a Randomized Trial. The Journal of nutrition. 2016;146(9):1651-9.

8. Joy JM, Lowery RP, Wilson JM, Purpura M, De Souza EO, Wilson SM, et al. The effects of 8 weeks of whey or rice protein supplementation on body composition and exercise performance. Nutrition journal. 2013;12:86.

 

Bio

Mike T. Nelson, CSCS, CISSN, MSME, PhD, is a research fanatic who specializes in metabolic flexibility and heart rate variability, as well as an online trainer, associate professor at the Carrick Institute, presenter, creator of the Flex Diet Cert, kiteboarder, and (somewhat incongruously) heavy-metal enthusiast. You can find out more about him at his website at www.miketnelson.com

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