Do You Have to Combine Plant Proteins at a Meal?

Amazing Health Advances

Do You Have to Combine Plant Proteins at a Meal?

Dr. Michael Greger — Nutrition Facts
Dec 27, 2018

Hint: It turns out our body is not stupid.

All nutrients come from the sun or the soil. Vitamin D, the “sunshine vitamin,” is created when skin is exposed to sunlight. Everything else comes from the ground. Minerals originate from the earth, and vitamins from the plants and micro-organisms that grow from it.

The calcium in a cow’s milk (and in her 200-pound skeleton) came from all the plants she ate, which drew it up from the soil. We can cut out the middle-moo, though, and get calcium directly from the plants.

Where do you get your protein? Protein contains essential amino acids, meaning our bodies can’t make them so they’re essential to get from our diet. But, other animals don’t make them either. All essential amino acids originate from plants and microbes, and all plant proteins have all of the essential amino acids. The only truly “incomplete” protein in the food supply is gelatin, which is missing the amino acid tryptophan, so the only protein source you couldn’t live on is Jell-O.

Those eating plant‑based diets average about twice the estimated average daily protein requirement. Those who don’t know where to get protein on a plant-based diet don’t know beans… (Get it? :) That’s protein quantity, though—what about protein quality?

The concept that plant protein was inferior to animal protein arose from studies performed on rodents more than a century ago. Scientists found that infant rats don’t grow as well on plants. However, infant rats don’t grow as well on human breast milk either. Does that mean we shouldn’t breastfeed our babies? Ridiculous! They’re rats. Rat milk has ten times more protein than human milk because rats grow about ten times faster than human infants.

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