Protein Myths: DEBUNKED! (Animal vs. Plant Protein)

If you’re familiar with mainstream health news, you’ve probably heard plant foods like quinoa, broccoli and soy are equally good sources of protein as animal foods, like eggs or steak. Sadly, these protein myths about plant proteins abound.

This misinformed logic permeates modern media. You have good reason to feel confused!

I’m here to clear up your confusion: plant and animal foods are not equal when it comes to getting quality protein. Eat according to mainstream logic and you may unknowingly pay the price with your health. 

Despite the info we’re constantly fed, getting quality protein is not simply about eating foods with lots of protein.

Just because you can get relatively comparable grams of protein in a cup of quinoa as you can get in an egg or an ounce of beef does not mean quinoa and eggs/beef are comparable sources of protein.

The nutrition rabbit hole goes deeper than that.

If you don’t willingly go down the rabbit hole and take informed action (read: on your plate), it’s highly likely your diet is deficient.

I make it my job to be your trusted science-backed guide on your journey down the rabbit hole, so you can discover—and enjoy—delicious nutrition truths.

In the following five sections of this article, I’ll unpack the BS–and the evidence-based truth–about foods high in protein, both plant and animal:

  1. Why It’s Important You Get Quality Protein
  2. Why It’s Not About How Much Protein You Eat (Grams of Protein)
  3. NPU: The Missing Piece of the Puzzle
  4. Animal vs. Plant Protein: A Case of Mistaken Equality
  5. What About Higher-NPU Vegan Protein Powders?

I’m here to guide you to think critically and make informed, empowered food choices so you can feel and stay satisfied.

Why It’s Important You Get Quality Protein

Unlike fat or carbohydrates, your body can’t store protein.

Your body is in a constant process of using protein for countless bodily functions, making it super-important to eat enough quality protein every day, at every meal.

Basically, we need to eat a lot more protein than our bodies use. For every kilogram of body weight (2.2 pounds), our bodies use 0.33 grams of protein each day just for bare minimum maintenance.1

With a few hundred varieties, protein is one of the building blocks of life (where it all begins!). It’s responsible for some pretty important things, like (but not limited to)

  • making up our chromosomes (how we pass our traits on to our offspring)
  • making up everything from bones, muscles, veins, arteries, skin, hair, nails, organs
  • making up antibodies that help immunity
  • making up enzymes that are responsible for countless chemical reactions in your body, including food digestion, and the breakdown of waste for elimination
  • making up hormones when they combine with substances called sterols
  • helping your body grow
  • repairing tissues
  • transporting oxygen around your body in red blood cells
  • transporting fat around your body
  • transporting cholesterol around your body, so it regulates the risk of heart disease
  • providing satiety after we eat it.2

So now that we understand how important it is to eat a diet that contains adequate quality protein, let’s take a moment to understand how protein works.

How Protein Works

Protein is made up of amino acids.

Your body can make some amino acids. There are twelve of these, called non-essential amino acids.

The eight amino acids your body can’t make are called essential amino acids; you can only get them from food.

When you eat protein in foods, your body breaks down the protein into amino acids and rebuilds them into new combinations that form new proteins needed by your body to run.

If you don’t have enough protein in your diet and, more specifically, if you don’t have enough of all essential amino acids in your diet, your body can’t function properly.

Just how important is it that you get enough of all essential amino acids in your diet? Amazingly-ridiculously-insanely important.

Take, for example, protein’s role in the form of apoproteins, in transporting cholesterol in your blood. If you don’t have all essential amino acids in the correct amounts, your body can’t properly transport cholesterol. For this reason, numerous studies have linked various levels of apoproteins to a potential cause of heart disease.3,4

Basically, the quality of protein you eat is integral to your body’s ability to manage any cholesterol (healthy and unhealthy varieties) that it makes.

You also need quality protein to help your body detoxify. In this modern world, our ability to detoxify is all too often inhibited. This means any cleanse program that doesn’t pay attention to, or propagates misinformation about quality protein isn’t going to work very well.

So yeah, getting the right kind of protein becomes even more important the more you know about the way your body works.

It just so happens the amino acid profiles of some foods match up better than others, in terms of amounts and varieties, with the amino acid needs of the human body.

For optimal health, including heart disease-prevention, you want to make sure you’re eating foods that contain the most complete amino acid profiles—and that you’re eating enough of these foods. (More on these foods soon.) 

Why It’s Not About How Much Protein You Eat (Grams of Protein)

I constantly read and hear media-chatter incorrectly asserting you can get just as many grams of protein from vegan (plant) sources as you can from animal sources. While this may be the case, it’s also an incomplete, irrelevant point(a protein myth if there ever was one) when it comes to optimal health promotion. 

Unless you’re mainly subsisting on a diet of grains, bread, cereal, pasta, other flour-based products and sugar, you’re probably not severely deficient in terms of how much protein you’re consuming. 

Whether we look at the Academy of Nutrition and Dietetics’ recs, or the cuisines of traditional cultures, getting just 15-30 percent of your daily calories from protein isn’t too hard. Though don’t forget: you do have to eat protein every day because your body doesn’t store it.

Remember how protein is made up of amino acids, both essential and nonessential?

Remember how you need to get—must get–essential amino acids from food because your body can’t make them?

Consider these reminders in the context of assertions from many health “experts,” who tell us we can get the same amount of protein from plant foods (beans, legumes (including soy), nuts, seeds, veggies, and to a lesser degree grains) as we can from animal foods (meat, eggs, dairy, fish and organ meats).

What it comes down to isn’t simply whether or not you’re getting enough protein in your diet in terms of grams; it’s the source and quality of protein. 

NPU: The Missing Piece of the Puzzle

See, there’s a little something called NPU (Net Protein Utilization), which qualifies (with a percentage) the protein in a specific food that your body can actually absorb and use.

There is widespread, unchecked hype and misinformation that postures vegan/plant protein sources as comparable to animal protein sources by excessively focusing on quantity of protein, as opposed to NPU (Net Protein Utilization).

The shocking truth is that if you don’t have enough of all essential amino acids, your body can’t effectively use the essential amino acids you do eat.

We’re all different, with different stats (age, weight, activity level), but that doesn’t change the fact that certain foods contain the ideal, highest levels of amino acids your body needs, and there are certain foods that simply can’t compare. 

Animal vs. Plant Protein: A Case of Mistaken Equality

Basically, proteins from animal foods provide essential amino acids and tout a higher NPU that proteins from plant foods just plain can’t.

For this reason, we call animal proteins “complete” proteins.

Interestingly enough, mother’s milk contains all the amino acids, in the precise amounts required by her baby (Nature knows!).

After mother’s milk, the best source of protein that has lots of the amino acids your body needs are eggs—whole eggs, none of this “whites only” crap. Nature put the egg and the yolk together for a reason and that reason is nutrient-dense and delicious (as you’ve learned, don’t worry about saturated fat).

After eggs, your body loves all the plentiful essential amino acids in pork, then sources like beef, chicken, fish and dairy.5

True, you can combine rice and beans to get a more ideal array of amino acids (again, we can measure it in a generalized way via NPU). That said, you would have to eat unreal amounts of these plant foods to achieve the amino acid levels your body needs, and that you could easily get from animal-sourced foods.

Again, to make matters worse, not getting enough of all essential amino acids on a daily basis puts you at risk for deficiency because you can’t effectively absorb each essential amino acid if even one is too low. Got plenty of seven of the eight essential amino acids? That one missing or deficient amino will jeopardize your body’s ability to properly absorb and use those seven you did get enough of.

Check out these numbers:

  • 6-1/2 eggs have an NPU of 94%
  • 5-1/2 cups of milk have an NPU of 86%
  • 5 ounces of Swiss or cheddar cheese have an NPU of 82%
  • 6.6 ounces of steak (beef) have an NPU of 75%
  • 1 cup cooked brown rice has an NPU of 74%
  • 1 cup cooked quinoa has an NPU of 68%
  • 2 cups of soybeans have an NPU of 66%
  • 2 cups of peanuts have an NPU of 56%
  • 36 slices of whole wheat bread have an NPU of 53%
  • 7.2 cups of dried beans and peas have an NPU of 34%6,7,8,9

Are you going to eat 14 to 21 cups of beans in a day (which is what 7.2 cups of dried beans makes when cooked), or maybe you could eat half the beans and 18 slices of bread instead?10 Not too realistic, huh?

True, quinoa contains all the essential amino acids, but not at higher levels, and it also only contains 8 grams of protein in a cup (cooked), alongside a whopping 40 grams of carbs (only 5 of which are fiber, the other 35 are starch). Women of average weight would need to eat about 5-1/2 cups of quinoa per day to meet daily minimum protein needs of around 45 grams protein. That comes out to 192 grams of starchy insulin-spiking carbs total! Not really realistic or smart, is it?

Wanna be realistic and smart? Eat animal protein. (Yes, doing this can be done ethically, and in a way that is super-beneficial for the planet–check out Chapter 7 of my book Eat Like a Fatass, Look Like a Goddess: The Untold Story of Healthy Foods.)

Keep in mind: the above figures are simply mentioned for the sake of comparison. In ways not related to protein, plant-sourced foods like grains, legumes, beans and plant oils are still not nutrient-dense enough, and too high in other things (i.e. starch, antinutrients, inflammatory types of fats) your body doesn’t need or need much of. Plus, soy is unhealthy for a number of reasons, and actually blocks your body’s ability to absorb protein (check out Chapter 6 of Eat Like a Fatass, Look Like a Goddess for more on this). Also, wheat isn’t ideal for many people, further making it an inferior source of protein (see Chapter 4). 

What About Higher-NPU Vegan Plant Protein Powders?

What about those vegan protein powders that combine protein from lots of different sources (grains, beans and legumes) to get as high of an NPU as possible? 

In terms of nutrition: such a plant-based blend will never contain 100% of the essential amino acids at the doses you need. Allow me to repeat: regularly missing just one amino acid, or having too low an intake of any one amino can have a serious impact on your ability to properly assimilate all the others you might have in abundance. This will impact your health.

If you have to turn to science-y powders with a blend of ten-plus ingredients, you’re not doing something right—especially if those ten-plus ingredients can’t even give your body everything it needs.

In terms of ecology: these protein powders require quite a bit of resources to produce these more comprehensive amino acid profiles. Why?

Because these protein powders are very condensed. Think about it: you get roughly 12-17g protein in 1-2 tablespoons. Whereas it would take you multiple cups of grains/legumes/beans to achieve the same number of grams.

Unfortunately, cultivation of most grains, legumes and beans–even organic varieties–require copious fossil fuels to transport fertilizer to farms, and to operate agricultural machinery (these are known as “inputs”). Plus, that “inputted” fertilizer can come from animals anyway.

To top things off, if those grains/legumes/beans are produced on a mass scale, via monocropping, topsoil can be destroyed within just a few years.

And let’s hope those ingredients are organic, because if they’re not then they are likely produced using copious pesticides, which are rampantly tested on animals.

Of further import: the majority of arable land in the US is not suitable for crop-growing, only animal grazing. Sadly, land-conversion (from grazing-land to crop-growing land) is one of the biggest contributors to greenhouse gas (GHG) emissions. 

While commercial animal production is obviously horrible, even organic grain/legume/bean production can place strain on the planet’s resources. (Contrast commercial animal agriculture to pastured-based models that actually reduce GHG emission!),

(For more on the ecological impacts of vegan farming, and the benefits of pasture-based farming, check out Chapter 7 of Eat Like a Fatass, Look Like a Goddess.)

Protein Myths: Conclusion

Someone had to say it. All of it.

To the detriment of our health, the logic behind higher-protein plant-based foods, and associated ecological recommendations is oversimplified and unscientific.

I’m not about absolutist practices. You should eat both plant and animal foods.

Just be mindful about relying too heavily on plant foods for adequate, quality, sustainably-sourced protein.

Now go enjoy some whole eggs, full-fat dairy, and/or meat–all ideally sourced from pastured/grass-fed animals! 

If you’re interested in the real food cleanse to end all cleanses (featuring delicious nutrient-dense foods, rich in saturated fat, all customized to your unique needs), sign up for updates about my proven system, TOTAL CLEANSE BOOTCAMP. This is how to do a cleanse. No juice. No wacky tactics. Just real food – tailored to your unique needs. And real results. Because you’re unique. Your diet should be too.

If you feel like you’ve already got the food-component down, but you’re still spinning your wheels and can’t lose weight, your situation may be more complex. We must always start with food, but the 80/20 rule applies when it comes to nutritional healing.

You may also be suffering from other imbalances that food alone can’t heal, whether it’s to do with hormones, your thyroid, or blood sugar axis (yes, you can have problems along this “axis” that food alone cannot fix!)–the list goes on. In these cases, you have to go deeper–and deeper than a lot of the information out there tells you to go (a lot of that still only scratches the surface). 

For about 80 percent of people, strategically updating your diet (like you do with TOTAL CLEANSE BOOTCAMP) will resolve your health issues (including stubborn weight). But what do you do when food changes aren’t enough? What do you do when you’re the other 20 percent?

If you’re part of that 20 percent, there is hope! This is where you need need to roll up your sleeves and “get under the hood,” as I like to say. This means digging in to your unique biochemistry, assessing root cause (which goes beyond food, and deeper than many “experts” our there go), and getting bio-individualized. 

Learn more about how my Custom Coaching can help, if you’re part of the 20 percent, and take the reins with your health!

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Background images: “Broccoli on a Fork” copyright Billion Photos; “Eggs” copyright Phodopus.