The Meat-Eater's Guide to Crafting a Meatless Meal, pt. 3

Meat Eater's Guide for Meatless Meals, part 1

Meat Eater's Guide for Meatless Meals, part 2

Meat Eater's Guide for Meatless Meals, part 4

Meat Eater's Guide for Meatless Meals, part 5

I'm going to take a bit of a detour in this post, as I feel I've overlooked something that's important when it comes to getting protein in our diets. This is the digestibility of different protein sources, how well the essential amino acids (the building blocks of protein that cannot be synthesized by the human body and must come from food) survive the digestion process. This is often referred to as the bioavailability of protein.

You've probably heard this already -- animal sources of protein (the flesh as well as eggs and milk products) are more accessible to the human body, while plant sources of protein (beans, seeds, nuts, grains, vegetable matter) are less accessible. Part of this is the amino acid composition of the plant material. You've probably heard that if you eat beans, you need to combine them with a grain in order to get the full spectrum of essential amino acids. In addition, plant foods contain certain anti-nutrients, naturally-occurring compounds which can block the absorption of minerals and amino acids. The result of both of these conditions is that plant protein is less bioavailable than animal protein.

Beyond this simplified distinction between animal and plant protein, within both the animal and plant kingdoms, the resulting foods each have their own unique rating of bioavailability for protein. I'm borrowing the following table and linking to the site (just under the tables) from where it came. This site has a reader-friendly article that explains all of this further if you want additional information.

https://www.nutritionadvance.com/animal-protein-vs-plant-protein/

https://www.nutritionadvance.com/animal-protein-vs-plant-protein/

The writer of the article explains that the DIAAS Protein Quality Assessment is the most recent and considered the most accurate method of rating protein availability. A score greater than 100 is considered "high quality." A score between 75 and 100 is considered "good quality/medium." And a score below 75 is considered "low quality" protein. As you can see, all of the animal sources of protein score in the "high" range. 

By the way, milk protein concentrate is primarily casein, the protein building block in milk. Some people are allergic to or have a sensitivity to the casein found in cow's milk. Goat's milk and sheep's milk do not contain the same problematic form of casein, and are therefore more easily tolerated. Whey protein is a by-product of yogurt and cheesemaking. Even though both casein and whey sound like they are each only part of or a component of milk, they both contain all of the essential amino acids.

Looking at the table for plant sources of protein, you can see that the only plant source that comes close to animal sources is soybeans. Whole soybeans contain all of the essential amino acids, likely the main reason they have been featured so heavily in many vegetarian meat analogues. The scores fall to soy protein (I think they mean soy protein isolate, which is what TVP is made from), pea protein (often found in protein supplement powders), and chickpeas/garbanzo beans, all in the medium range. Yellow lentils and pinto beans are just below the threshold for a medium score.

While this assessment looks grim, for those of us who may find themselves eating a whole lot less meat in the near future, here's the good news. This scoring is based on the quantity of essential amino acids in individual animal or plant foods and doesn't take into consideration the practice of combining different types of protein foods, such as eating beans with a grain, beans with eggs, grains and cheese, etc. 

According to this article, It's true that plant foods may lose about 10 to 20% of their protein availability due to those anti-nutrients and fiber. However, I would guess that most of us are capable of eating far more grams of protein than what meets the minimum for health. The other concern is the essential amino acid leucine. While plant foods like lentils do contain leucine, they don't contain as much of the essential amino acid as animal foods do. However, this is easily remedied by adding a small amount of an animal protein source, such as a bit of cheese, a little milk, or an egg to the meal that is prepared primarily using plant protein. Here are a couple of easy examples:

• peanut butter on bread, with a glass of cow's milk on the side
• refried beans in a flour tortilla for a burrito, with some cheese added to the filling
• TVP spaghetti (as I used for illustration in the first post on this topic), topped with Parmesan cheese
• or, one of my favorites, huevos rancheros, adding beans to the skillet along with the corn tortilla, then topped with an egg

The same article also mentions that of all of the plant foods, soy foods contain the highest amount of leucine. This would include tofu, soy milk, soy protein isolate (TVP and powders to add to shakes), tempeh, and edamame. In addition, quinoa and buckwheat (grains or pseudo-grains) also contain enough of all nine essential amino acids for the human body.

Finally, one last table, just for reference. This one readily identifies which foods to pair together to get the complete amino acid set for your body to use as protein when only consuming plant sources.

https://nutrition.org/protein-complementation/

We often hear about dishes that use complementary amino acids, such as beans and rice or peanut butter on whole-grain bread. This table shows which essential amino acid is deficient for the plant protein food, and in which foods to find it. Basically, beans go with grains, nuts, seeds, or corn. And vegetables (such as Brussel sprouts, asparagus, broccoli, avocado) find their lacking amino acid in grains, nuts, or seeds, but not in beans.


All of this goes back to what I said on day one of this topic, that I try to use 3 or 4 different sources of protein in every meatless meal that I prepare for the family. The TVP spaghetti meal -- pasta (grain), TVP (bean), Parmesan cheese (dairy), sourdough toast (grain). Okay, so the pasta and toast both came from grains. 

With the Cabbage Patch Soup meal mentioned yesterday -- lentils (bean), Parmesan cheese (dairy), Yorkshire pudding (egg, dairy, grain), pumpkin pie (egg, dairy, grain).

Here's another meal, last night's Cinco de Mayo feast. My daughter made baked nachos, using corn tortillas (corn/grain), refried pintos (bean), cheddar cheese (dairy), TVP (bean), yogurt (dairy), and about 4 ounces, total, of ground beef (animal). That amount of beef meant that each of us ate 1 ounce of meat. In our house, we not only eat meatless meals, but we also eat less-meat meals. I sometimes use just a bit of meat in a meal to add to the satiety of a dish. This is another way that we deal with having less meat available, for whatever reason. For dessert, we had a Nestle Tollhouse cake (grain).


For additional information:
https://www.nutritionadvance.com/animal-protein-vs-plant-protein/
https://www.todaysdietitian.com/newarchives/0419p30.shtml

The first article does a good job of explaining how protein foods are rated for their usability in the human body. The second article of the two provides an alternate viewpoint to the first article, in that the author of the second sees protein foods not as isolated individual foods, but as part of a larger diet that combines and complements various individual foods into a whole. Both are good reading and helped me understand how to make meatless and less-meat eating better for my family's health.